For the last two nights my electric sockets have all tripped in the middle of the night and I have narrowed it down to my immersion heater on my tank. This morning with everything bar fridge switched off , I set the timer on immersion and waited, immersion didn't seem to come on as there were no lights or noise, but at end of time that time was set to (if that makes sense) the trip switch went, it wouldn't switch back on, so I switched immersion off and then trip switch back, so all sockets working again, then I switched immersion back on and it tripped! I have a grasslin ecosave timer. I know I will need an electrician, but if anybody could suggest anything I could try to narrow it down anymore before calling one,or what could be the possible causes so that I'm not completely clueless when electrician arrives! Also, I've got no idea how to find a reputable company??? I'm having a bad time at the moment with a new kitchen fitting that's gone wrong too and have been badly ripped off (but that's for another post) so really reluctant to get anybody out... thank you in advance