Thanks everyone, small update. Even though I have several attempts at this hook tool and no joy, given the cost difference between the backrest and the tubes, I will be this weekend going down the cutting the insopection hatch route . So thanks Rob that sounds like a plan and and I will report back.
In other news when I did the front seats swap I full expected to have to clear the airbag light as I guessed tinkering with the seats would cause the code to come up. So when all fitted I got out my handy OBD eleven and cleared the code. Did it work, nope, no matter how many times I tried it. So then got out my vagcom this morning before work and tried that. Yes cleared it, and immediately came back !! Thinking something must be wrong for it to be as stubborn as that.
So got on my hands and knees and took all the plugs out , spray of contact cleaner, reset it again with VCDS and all is well with the world. Must have just been a dodgy conenction.
Talking about plugs, the seats I received have extra plugs , assuming this is heated seats but as my car does not have that I guess unless I go down the route of swapping out the climate control unit plus buying one of those looms I shall just have to have a cold bottom on cold days