I have a Continental Gatorskin 25 sitting around without a partner. It has been ridden for around 2-3 weeks, at which point I swopped it out. As such it is in great / close to perfect condition. The little bits of pointy rubber denoting a new tyre are still present on the riding surface itself.
I'm looking to swop for a Conti Grand Prix, any version is fine (i.e. original Grand Prix / classic / 4000sII / 4Season etc.) It needs to be 25 or 28. Similar condition.
I'm South London based.