Well you dont have to worry about heathcare as the NHS takes care of that.
Incorporating is quick. Taxes are simpler than the states theres only one sales tax, one income tax and none of this complex mixture of 52 state taxes.
BUPA is pretty cheap (maybe 1/5 of a US health policy if healthy and young down to 1/25 or less if you have pre-existing conditions) because it's just an add-on to NHS.
But not in the context of a startup which is the context I was talking about your right a lot of the big firms on the FTSE will offer BUPA or somthing similar.
I think it's really important from the beginning to say that you care enough about your employees to get them the best healthcare you can afford.
It's not really that expensive, so why wait?