Just a quick note to keep you updated on progress.
I have managed to get enough steel staircase and handrail fittings (second hand) to make up into the access down from the wheel bearing platform into the bottom of the pit. The parts are currently being cleaned of rust/debris and painted with black hammerite paint. Once cleaned and painted I will get the parts down to the pit ready for on-site assembly. I am quite sure that there will need to be some re-modeling as a straight set of stairs wouldn't work. The cost will be well within our £1000 budget.