What driver at say under 400 uk pounds is best for distance.

A taylormade burner.

depends on ur game if u go to a good pro they should b able to custom fit u and let u try some clubs to see wat u need

they need to take in account your swing and find something that fits it. every1 is different

you really cant go wrong with a callaway big bertha.

l would recommend u go to ur local Pro to get fitted for ur club. If u r going to spend that amount of money then it is a waste of time & the money spent if u can not get the distance u want from the club.
Your Pro will measure the size of ur hands to see the size of grip u will need, the length of the distance from ur hand to the floor to see what length of shaft u will need, he will also check ur swing speed along with the spin ratio. All this has to be taken into account when paying money for ur clubs. Well u would not buy a car without a test drive, would you?

ermmm l am sure no drivers are over 400 quid, but the burner is the best for Most people. But you are not most people. You are you, so go down to an american golf or direct golf range and try out clubs. Decide on how they feel, what they look like, distance and accuracy.
But as l say, the burner is best for most people.