Can you help to identify these frames, bikes or parts?

There's a German brand Pegasus, but I cannot imagine that they ever had a 753 in their range.
More heavy steel city and trekking stuff.
Private label of ZEG buying group.

http://www.pegasus-bikes.de

Thanks Mr Cheese.......I was told it was English, and top end frame........The guy that I'm getting it from (maybe!) is an ex youth track champ and my old (retired) boss, so I know it's kosher....I need a look and pictures, I guess