Also if the UK investor says "we'd love to invest, can do the whole round, want you to send us your current cap table, we need to get the deal done before April because we have capital to deploy before end of the current financial year" don't actually expect the funds.
I had the misfortune to be pitching to VCs in the UK, the money was so expensive that it’s just not worth it, much better off moving to the US if you can.