James, I wouldn't recommend you fiddle. If you don't know what your doing you could seriously injure yourself. Call a qualified spark out. Is the cooker a new install or has it recently started playing up? The RCCD is the circuit breaker at the consummer unit, the switch you reset each time it trips the power to the flat. This could be the wrong type. As I say the safest option is to call out a qualified electrician.
Mike
September 2004