On the bright side, I knew nothing about this before he put his foot in it; now I do so I made a donation, although not as generous as his. https://www.row4mnd.com/
FFS. VAT is payable on all supplies of goods and services in the UK. There are exceptions (principally most foods) and exceptions to the exceptions ( such as hot food). It's all just VAT. Often some dimwit tries to apply some misleading pretend name to what is simply VAT on something. Nothing to see here, move along please.
Even my basic grasp of maths can work out 20% on £1.80 doesn’t equal £2.70 so politely, fuck off, once again