Hi Les,
My very early S1 Roadster, 2004 with the Getrag 5 speed gearbox was purchased from Berrybrook (nice people to deal with) last December. I upgraded it straight away with the SSL front and rear suspension kits. It's a lovely car to drive - easy to potter along at 20mph when required but having startling acceleration too. It gives well over 30 mpg on basic unleaded. If you'd like a drive, message me. I live in North Somerset, presumably not too far from you.
Incidentally, the road tax on Roadsters registered before 23 March 2006 id £395. After that date it rises to £675. At some time (late 2007? can't be sure) the Roadster emissions reduced so that it fell back into the £395 category. If that is relevant to your decision-making, then check the emissions of any Roadster offered for sale by entering the registration number onto the DVLA Vehicle Enquiry facility.