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No problem, common when the weather is bad. There should never be one RCD covering the whole consumer unit. The point is to leave you with some power so you can safely find the fault or exit the building.
A little illustration of a nuisance tripping problem for you....
I went to a house in my street before christmas, same problem, tripping overnight. We had a lot of rain and the first for a while so I asked about exterior wiring. The householder told me, no we don't have any. So I'm looking around the garden room and see a light switch on the wall next to the door. I ask, what's that?. Ahh, he says, garden PIR. So we go outside and the conduit comes from the first floor bathroom to the outside light. We look in the bathroom, there's an immersion tank with a spur off the socket to another socket hidden in the top of the cupboard with the outside light plugged into it. Unplug it and the circuit works without tripping. Replaced the cable and light fitting and no more problem tripping.
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Airhead
Thanks, again! Yes, idiot mistake, there was another switch in the box that controlled a group that I could see in the dark. House sockets are on a different group so that’s peculiar.