BUYING a whole computer.
You should check US hardware prices, then calculate weight
and shpping cost to UK.
It will probably cost you about the same to buy in UK if parts are available there.
When i started my last build, i had no choice we don't have any
top end pc parts here, so i had to get everything from US online
stores Newegg, Tigger Direct,Compusave.
Just shipping everything here, and a few RMA's cost me about a $1000.00
And i am a lot closer than you are. So i suggest you do the math
before you have the problems i had. 😉