Replacing Macbook Pro HDD with SSD question

Hey guys, thought i'd ask the experts on apple core :) i'm thinking about changing my macbook HDD to a SSD, i dont use more than 30-50GB.

i'm aware that the HDD can be replaced via some technical work and prodding, i'm just wondering is there any place online or in person that is more qualified (than me :P) who offers this service

I live in the U.K by the way

thanks in advance :D