Thanks, I'll have a look
Last night I usedsome Nitromors actually to see if there were any markings or logos. I tried the head tube, the side of the down tube, and the seat post tube, nothing at all. It makes me think that maybe it was stolen once and the person disguised what it was. There are serial numbers under the BB though:
on one side, and
on the other
well thats a bit of luck maybe.
Obviously the first number is a former owners post code . It might be worth contacting the residents of the 8 or so houses in that post code range. They might be ablr to tell you something about the history of the frame.
The chances are that the 87 part of the other stamping is the date of the frame which sounds quite feasable actually