Not quite bigger than Covid.
https://researchbriefings.files.parliament.uk/documents/CBP-9309/CBP-9309.pdf
"The Covid-19 pandemic has resulted in very high levels of public spending. Current estimates of the cost of Government measures announced so far range from about £310 to £410 billion. This is the equivalent of about £4,600 to £6,100 per person in the UK."
This is a result of successive government abrogating their responsibility to ensure the UK's energy independence and security. In 2011 Nick Clegg (remember him - then Deputy Prime Minister?) turned down the idea of spending on nuclear power stations as "they wouldn't be ready until 2022." Guess what year we're in now? As recently as 2017 Centrica closed the Rough Gas Storage facility off the east coast. This facility doubles the entire UK storage capacity. The installation needed repairs and the government would not underwrite the cost.
So now the taxpayer has to underwrite the cost of paying the market rate for gas and electricity for at least the next two years, and probably longer than that. You gets what you pays for (or in the UK's case, what it wouldn't pay for).