Oops, forgot to update!
I got the car back last Saturday, however it doesn't go to the mappers until Wednesday. It was a really painful drive back, having to stay off boost, but every now and then I let the turbo spin up a fraction to hear that glorious noise Should be a hoot, can't wait for this week to be over. The car is also much quieter now too, which is an added bonus. I'm going to add a Lexan screen to the back of the hardtop as well, to reduce that huge weight sitting above the car, cost is only £200 + fitting.
I asked them about the cage, and they can do a half cage based on their full one but with the front bars removed. Patrick said he's never been asked for one, but could find the cost if needed. I suspect it wouldn't be any cheaper than your one though, so probably not worth the bother. That said, the full cage isn't that intrusive really, so maybe worth looking at?