Collected my Grenadier and drove 71 miles back to work mostly motorway at 70mph at 18.6mpgThat's worrying.
I'm trying to recall if the engine/ignition was on when I jacked the front up and went from lock to lock for some photos of the steering lock stops; I do recall the steering being very easy to move with one hand though. I actually think it was off.
Given it's an electric pump, I wonder if pulling the fuse and driving it around would give your symptoms or different?
Your inability to move the steering almost sounds like the hydraulics were active but working against you.
Gateway control unit changed and steering fine so far so hopefully that’s solved the problems. Thanks to Harwoods for getting the part fitted as soon as it arrived.
Interestingly the technician was talking to me about the steering dampers and here’s what I took from the chat:- the steering damper is really strong and would make the steering even heavier if power steering not working. And a good tip was if you ever get a power steering failure for what ever reason such as a split pipe when remote from help then disconnecting the steering damper would free up the steering enough to make the vehicle drivable although steering would be very light at speed so extra caution should be taken.