UK Government spending is now about £1tn annually. £22bn is 2.2% of that. Any spending has to be balanced out and MMT does not fully account for this. What kind of an economy do we want? Currently, we have one where wealth is spread quite un-evenly (demographically and geographically). Highly mobile (for capital and labour) and based on trade (rather than production, for example).
To re-distribute wealth more evenly would (inherently) mean taking money away from one part of the economy and putting it elsewhere. There are pros and cons to each approach.