I will buy in Euro and will therefore pay VAT iiuc, will then sell in GBP. I’m led to believe that if I can’t claim the VAT back then what I sell will be expensive.
That’s nothing to do with buying in euros, just the nature of not being vat registered. If you buy in the UK in pounds you’ll still pay vat then not add vat when you sell. You just need to price jobs accordingly.
That’s how part of my business works. I buy stuff, do some work on it then sell it on. I’ll charge what the materials cost me (including vat) plus something for my time and a little extra for contingency.