Thanks for the reply Jim. I've been trying to do as much research as possible, and have found some good info on here about where to look for numbers etc. Ideally, I will have time to inspect the bikes, and then contact the machine register to have them identified. However, due to the nature of such things, I will likely have to make the decision there on the spot. I know my uncle said the guy wanted something like 50K for all three bikes, but that was 15 years ago. As far as I know, all bikes are supposed to be runners, but have had the crankshafts taken out?! Just what I've been told. Apparently the guy was quite paranoid about them being stolen, hence removing the cranks. From memory the so called 'White lightning' is painted white, but I'll have to confirm that.
To me it seems that if the 'white lightning' bike is complete, restored, but in bits, and actually a Rapide, its probably worth only ~30k? It will most likely have missing bits and require some (probably a lot!) work to get it running. Anyone care to comment? Need a rough idea so I know don't overpay.
The racing bikes - well I have no idea. I don't know the history. I have the feeling however that they wouldn't be worth as much as the road going one, as apparently they have been heavily modified. Any comments?