Politicians and think-tanks are urging investors to “back British business” by putting more of their savings into domestic shares. It’s an emotionally appealing idea — who doesn’t want to see British companies succeed and the UK economy thrive? But investing in UK stocks shouldn’t be seen as an act of patriotism. The evidence shows that global diversification, not home bias, gives investors the best chance of achieving their financial goals.
Every few years, the call goes up: back British business. Politicians talk about supporting home-grown companies, think-tanks urge pension funds to invest locally, and the City briefly rediscovers its love of UK stocks.
But while patriotism has its place, investing in equities isn’t a loyalty test. It’s about maximising return for a given level of risk. And when you look at the evidence, one conclusion stands out: global diversification beats patriotic investing every time.
The political push — and why it’s misguided
The campaign to channel more savings into UK assets has been gathering momentum. Ministers have highlighted plans to make capital markets more attractive for companies to list and to reform financial rules to make it easier for ordinary people to move money out of cash savings and into investments, such as stocks and shares ISAs. The thinktank New Financial recently called for pension funds to invest 20-25% of their equity holdings in UK companies.
It sounds sensible: Britain needs capital, and investors need returns. So why not keep the money at home? Because the goals of policymakers and investors aren’t the same. The government’s job is to stimulate the economy. Yours is to protect and grow your own wealth. Blurring those objectives risks turning your portfolio into an instrument of politics rather than prudence.
“The government’s job is to stimulate the economy. Yours is to protect and grow your own wealth.”
The evidence — how UK equities have actually performed
In relative terms, the UK stock market has delivered disappointing returns over the last quarter of a century. Between the start of January 2000 and the end of September 2025, the FTSE All-Share Index produced annualised returns around 3% lower than those of the MSCI World Index. The UK now accounts for barely 4% of global market capitalisation, which is less than Apple and Microsoft combined.
This lag isn’t a short-term quirk. It reflects deeper issues: low productivity, weak wage growth, political uncertainty, and a market dominated by banks, oil, and mining rather than technology and healthcare. London’s stock market has also shrunk, with fewer companies listing and more choosing New York instead.
Yes, relative to US shares, UK shares look cheap. But cheap can stay cheap for a very long time.
So how much is too much when it comes to investing in UK stocks? For a globally diversified investor, holding around 4% in UK equities roughly mirrors Britain’s weight in world markets. Even 10% could be justified for those who want a home bias for familiarity or tax reasons. But 20% or 25% — as some politicians and think-tanks are urging — represents a heavy concentration.
Behavioural traps — why home bias feels safer than it is
If the data is so clear, why do UK investors still hold so much at home? The answer lies in psychology.
Home bias, the tendency to invest disproportionately in domestic assets, has been documented for decades. It feels comfortable to own what we know: brands we buy, companies we recognise, a currency we understand. But familiarity can blind us to risk.
It’s also important to remember that, if you live, work, or own property in the UK, you’re already heavily exposed to the domestic economy. Your salary, pension, house price, and even the cost of living all depend on how Britain performs. That’s precisely why your investment portfolio should look beyond these shores.
Think of it this way: betting your retirement on the UK stock market is like putting all your savings into your employer’s shares because you believe in the company. It might work out, but it’s hardly a sound plan.
Even if the UK market recovers, over-concentration magnifies risk far more than it boosts reward.
The small-cap bargain argument — and its limits
Supporters of the “back Britain” movement often highlight smaller companies as an overlooked opportunity. Valuations are undeniably low. The FTSE Small Cap index has been trading at a discount of more than 40% to global peers. Advocates call it a once-in-a-generation buying opportunity.
They may be right that UK small-caps look cheap. But cheapness alone isn’t a reason to overweight them. Smaller companies are more volatile, less liquid, and often concentrated in a handful of sectors. They also rely heavily on the domestic economy — the very thing many investors are trying to hedge against.
There’s a case for a modest tilt towards smaller, more profitable firms as part of a disciplined, evidence-based strategy. But tilting isn’t betting. A small allocation adds diversity; a large one adds danger.
It’s one thing to tilt slightly towards value or small size; it’s another to anchor your future to one small corner of the market.
The rational alternative — own the world
The global evidence is clear: broad diversification across markets and asset classes maximises the likelihood of success. Decades of research — from Markowitz’s (1952) modern portfolio theory to Fama and French’s (1992) multi-factor model — show that risk and return are best managed through diversification, not concentration.
Owning the world doesn’t mean abandoning Britain. A global index fund already includes UK exposure proportional to its size. If Britain prospers, you’ll share in the gains — but you’re not hostage to a single market’s fortunes.
At rockwealth, we advocate simple, low-cost portfolios built around global index funds — systematic, transparent, and grounded in evidence. You can still support the UK in other ways: by running a business, paying taxes, creating jobs, or donating to local causes. None of that requires concentrating your wealth in domestic shares.
We all want to see British businesses and the UK economy thrive. But investors shouldn’t have to accept lower returns in pursuit of that goal. The most responsible thing any investor can do for Britain is to stay solvent, diversified, and invested through every market cycle.
Conclusion — pride without prejudice
The call to back British business appeals to our sense of belonging. But sensible investing isn’t about loyalty; it’s about logic. The UK market may yet have its day, but basing your financial future on patriotic hope isn’t a strategy.
“The call to back British business appeals to our sense of belonging. But sensible investing isn’t about loyalty; it’s about logic.”
Prudent investors don’t shun Britain; they simply keep it in proportion. Owning the world means owning Britain too, in its proper measure. The best way to strengthen the UK economy is to stay wealthy enough to keep investing in it for the long haul.
In the end, the smartest approach to investing in UK stocks is moderation: a healthy slice, not the whole pie. Global diversification isn’t unpatriotic. It’s just prudent.
If you live in the Lake District or the wider North West and would like to explore how an evidence-based investment approach could work for you, book a discovery session with our team today.
IFA and Financial Adviser in the Lake District, Cumbria
rockwealth Lake District is an evidence-based and fixed-fee Independent Financial Adviser situated in the Lake District.Interested to work with us?: Begin your financial journey with us through an Initial Discovery Consultation, completely free of charge and without any obligation.
Discover us at: rockwealth Lake District, Victoria Hall, High Sand Lane, Cockermouth, CA13 9NA.