Peugeot 106 power steering problem

[swansea v6]

I have just picked up a 106 as a first car for the gf and although its a half decent car I bought it for a knock down price as the power steering doesn't work. So before I just try and change the power steering pump are there any other things it could be?? Fluid is all topped up and clean, are there any known common faults with these? blown fuses or knackered relays etc????

[swansea v6]

Car can be driven but only just!! as you turn into a corner it suddenly stiffens up and seems to lock, fun in the wet!! Will pick up a trusty old Haynes manual and have a crack

[swansea v6]

Cheers it's on an R reg and has the 1.1 injection engine