[Danny]

When I make a sharp right turn (about 90deg), the steering wheel "gets stuck" or ceases up for second then thumps back into steering mode. When this first started to happen, he said that the power steering belt was loose and it was getting stuck

I'm really not convinced by your mechanic. I'd find someone else to be honest, someone with Land Rover experience. Finding out why the steering locks should be pretty straightforward once the car's up on a ramp

New brake discs (rotors) are not expensive and well worth doing.