The most valuable part is the frame, and the guy who wants the frame will not want any of the other parts except the stem and handlebar, but the stem is rusty.... The rest of the parts are from the wrong period and aren't particularly high end or rare anyway.

I imagine the frame with stem and handlebar will bring 100 - 150 GBP on ebay (you should peruse www.hilarystone.com for a better idea of what you can ask for a frame of this vintage/condition). The rest of the parts, if included, wouldn't change that very much since the buyer would have to pay a lot more shipping.