Boris Johnson and Rishi Sunak will on Thursday challenge UK-based investors to invest in more “British success stories” in order to fuel the economy’s post-pandemic recovery.

Sky News has learnt that the prime minister and chancellor will issue a joint rallying cry aimed at “igniting an Investment Big Bang” that would “unlock the hundreds of billions of pounds sitting in UK institutional investors”.

In a letter to institutions, the pair will say that UK pensioners risk missing out on “better retirements” because too small a proportion of their pension funds is being invested in long-term UK assets.