Spending dollars?

(bit of a newbie on this stuff)

I've had a reasonable amount of dollars in a us bank account for a few years now and am reluctant to transfer it to the UK because of the unfavourable exchange rate that has been prevalent for while.

I've been thinking of paying for items that I already need in dollars.

for example, I need a new car. I wouldn't want to pay in dollars just to get it converted to sterling, that would defeat the purpose of avoiding the exchange rate.

is it possible to buy goods in dollars abroad, for example for a car that will be imported, but will be suitable for the UK market?

hope I've been clear.

Thanks in anticipation :)