UK Scotland Invercoe campsite
 

I've overnighted with a tent pitch at this campsite on the edge of Loch Leven:-
Invercoe Highland Holidays , Glencoe Campsite

It's well located right on the edge of the Loch and near to the village of Glencoe.
I've read the reviews in that website and I broadly agree with them, but I was there for just a night.
Since being there (2004), I have heard that the hotel/pub that is within walking distance has now closed (name = Glencoe Hotel?) - the one where the Glencoe mountain rescue team meet and have a store/hut nearby.

No problems with having a bike in there, including flat ground throughout. There were a few bikes in there and various types of cookers were used.