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Don't worry folks, I'm very grateful for your advice here, but I know replacing the RCD is too far outside my experience to attempt myself. I'm just trying to have a rough idea what is needed to be tested and done before getting an electrician in. (again) Having found the TT pin I can...

If I form a circuit with the earth pin and the earth in a house socket with a 12 volt pack and only complete the circuit with my multimeter, that should prove it is connected?

1. Having no real reason to assume the earth pin is not connected to the house system leaves me with the way ahead for my original problem of trip-outs. Perhaps I should go ahead with the fitting of an S type RCD of 300mA instead of the present 100mA unit and see if that helps? 2. Is there...

A good start, but where's it connected in the house. Dunno. It goes into the cavity wall near the outside meter and service head which is also near the internal switching as pictured. Where to dismantle first?

Bit happier now.

I have replaced several old sockets in the last weeks or so, certainly with earth connections of course. Do I need to take the front cover off the RCD to look for earth wire? Or perhaps loosen the indoors unit board to look at wires behind it. A bit worrying..... I'll go outside and examine...

Far left the RCD. Above the box of MCBs (previously push-in fuse wire containers) is an old front door bell transformer. Separate switch and two MCBs below covers separate garage and (now defunct) outside lighting. The board to which this is all attached is under a sink in the cloakroom. (Sink...

The black box beneath the meter. The digital meter was new in 2010. No sign of an earth cable in the meter box. Wording on the black box is ISCO Series 3. Cables beneath the meter are all labelled either L1 or N.

That task was interesting! The pic of the two cables entering under the roof was made "private" somehow or other. This pic is inside the meter box on an external wall. IN and OUT cables run inside the cavity wall. Does seeing the black thing beneath the meter help? Thanks for your interest...

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"Suppliers service head" Is that likely to be where the cable enters the wall just under the roof or back along the two lines at the local reducing transformer. (bit dark at the moment) :)

Just for info. the one main RCD is a grey box: Wylex "Residual Current Operated Circuit Breaker" 240V 50HZ 63A Load WSEM 63/2 100mA Trip Just in case that makes any difference. The house has 2 overhead lines bringing in the power. Does that mean we have to have our own earth pin...

Many thanks for those educative and amazingly fast replies to my first ever post here. I will look into the power surge protection possibility. Just to be clear, if it is possible to set up a non-RCD-protected circuit for the freezer and heating only, what is the reason this could not be...

Have read a previous trail on RDS tripping but electrical storms were not mentioned. My house is rural with an overhead mains supply. There is one 100mA RCD plus eight MCB. Whenever we are away (or at home) the RCD will trip if there is a nearby thunderstorm. Just our house, not a general...