eBay and Craigslist finds

Well, considering the fact that these headsets are pretty unique and race, it could be a good purchase.
But a few hundreds of GBP is quite a lot for a headset.
Some people would pay the starting price.

Bear in mind that the headset locknut is on the stem(presumably stuck), the bottom race is on the forks(which are scrap) and the bearing cups in the frame appear to have gone missing I doubt it would be a good purchase. Assuming that you won the items you would still end up with half a headset. Besides would you want to line his pockets with your hard earned cash!!!