Electric cooker, sealed element (ceramic hob, not the ring element) only 7
years old. Recently, if there is the slightest bit of moisture it trips the
RCB and the whole house goes out.

The wiring is a little scorched, but still looks sound, but sometimes it
also happens as the ring is turned OFF, which is odd. Can't find any shorts
or

The cooker fuse is MK LN5930 - I think this is the closest spec sheet.
http://www.tlc-direct.co.uk/Technica...entry/RCDs.pdf

I can't find any mini rcb to replace the fuse, so the cooker doesn't black
the whole house out.

Meantime, is there some way I can "damp" that circuit, so it's a little less
sensitive?