Hang on a second there.
I thought that ovens were supposed to be on their own dedicated circuit, fed direct from the Consumer unit?
What I mean is, why is there a plug-strip connected to a 32 amp circuit in the first place?
While I'm not totally conversant with the Wiring Regulations in the UK, but I would have thought that an RCD was not necessary on something like an oven, owing to it being a stationary appliance.
Over here in NZ, we don't put ovens or refrigerators on an RCD, mainly due to the heating and cooling of the appliance causing nuisance tripping due to possible moisture build up and this in turn lowers the internal insulation resistance and causes the RCD to trip.