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the supply chain for the UK broke because of the Brexit as more regulations were set up for goods going and coming to the UK from the EU block. the lockdown also disrupted international trade and to make matters worse the economic policy that was adopted during the lockdown to support the UK economy. this where inform of stimulus package injected in the economy to support people create a large pool of money circulation in the economy which increased people demand relative to low supply. so the available products were to be heightened in prices, simple capitalistic market.
so the pound will be gaining value against weaker currencies but I wouldn't bet against the dollar on GBP\USD currency pair for the united state's inflation is still greater than that of the UK at 6.5% to 4.2% respectively. I would watch the pound sterling against the euro, Japanese yen, and other weaker currencies.
Disclaimer: Note that the securities exchange market is highly risky and you can either gain or lose your money, so trade with caution.