First of all thanks for all your replies. Back to the task in hand, I took the belt off the pump and turned the pulley over by hand and it turned easily and pumped fluid out, i also tried to turn the steering with the road wheel and it wouldn't budge at all and sounded really clunky. Looking at the pot it looked a little twisted, so i've pulled the steering column off the worm gear and then tried to move the steering again with the road wheel, this time it turned smoothly by hand and pumped loads of fluid out where the pipe was off, so i'm thinking that the problem may be in the column.
I haven't took it out yet but could it be the pot that goes onto the worm gear that's the issue ? because there's nothing else i can see, that could cause it to bind ?
I dont think the parts behind the steering wheel are all the correct ones because the nut wont go all the way on, which makes me think that the piece with the horn ring might be too deep, so i might shave a bit off it on the nut side.
Mick