Peter, I saw Tim's bike at one of Committee meetings at the Spares Company and it has this really professionally made frame holding up the rear of the seat with tensioners, attached to the middle of the support struts off each side , going forward to, I think, the sidecar mounting hole. I mentioned it on here and I seem to remember Tim posting a photograph. Whether Ben designed and made it or not I dont know but as it is their design and Ben works on bikes to earn money then I assume that they could help out somehow.