A cycle jumble sale is like any jumble sale - a mixture of good bits, ok bits and a load of junk
There's quite a few regulars, such as a guy who sells old Campag stuff, people selling classic bike bits etc, mixed in with people who have some stuff to sell after clearing out the shed or fitting out a new bike. You just never know what you are going to find... Always find the couriers there too.
I'm going to support a friend who's selling some stuff for an old cycling friend who now has Alzheimers - he's previously sold stuff for people who have died and left their families with sheds loads of old cycling equipment. At the end of one of the Hilly 50s a couple of years' ago, a lady came up to us and asked for assistance in disposing of her husband's tt stuff after he died. I think that's the guy Ivor got his angry chicken helmet from