Looking at spending alone is surely short-sighted? Taxation was at its lowest under the Tories and we didn't grow much then either. With Reform all growth will just be drained into the pockets of faceless non-doms under mates rate arrangements under Farage just as the US has become with Trump.
Millions are on long-term sick and productivity is suffering alongside historically high living costs, that's where the growth has gone, it has nothing to do with taxation. Nobody is struggling to pay their bills because of taxation, the poorest and middle classes barely pay any tax but they are paying record rents and energy costs.
Resolve health problems, get people back to work and make it worthwhile, sort out the crazy energy costs and robbing supermarkets and people will have cash to spend... The economy will then grow and government will finally act for people instead of treating them as an accountants spreadsheet.
Or are you arguing that the economy is not growing because Tesco made £3bn this year instead of £3.2bn due to Reeve's NI increase (I made this figure up but the analogy is there)? People should be at the heart of government policy on the economy and this will never happen with Farage.