Moist chamber success rate?

[ian]

I know some of the collective have tried moist chamber for finding wild slimes, can anyone tell me roughly what sort of success rate they have?

Yeh I know that's a piece of string the question but given an average Uk woodland and random lumps of wood, bark & leaves.... I have visitors at the end of next month and they really really want a wild slime to view.

For those not in the know, moist chamber basically means shoving random bits of landscape into dishes and keeping it damp and dark in the hope a slime mould appears.