Started this as a new thread as I'm sure theres lots of newbie jumblers.
I've found that there is a whole range of genre's at jumbles. It is very much like a boot sale, whatever you don't want take it along.
Traders will jump on you as soon as you drive through the gate, surrounding your car like a pack of hyenas around a bison carcass. My first jumble I made over £200 before I'd even walked through the door! Next jumble I went late to minimise trader harassment and still done just as well.
Good experience jumbles. The difficult thing is walking around with your hands in your pockets!