No power coming through but RCD didn't tripped

[crystal ball]

Yes, he said I will get you back to sort out my heating, not on your nelly matey

 

[fluorescence]

Some worrying things in that fuseboard....

i). Garage MCB is the wrong brand and has been bodged to fit the board.
ii). Garage MCB is a B40A - is the cable feeding the garage really suitable for that current?

iii). PV array is also a B40A. Thats one big solar array if that is correct!

iv), Outside lights on a B16A - I hope it isn't wired in 1.0mm2.

v). Doorbell on a B16A - thats gonna be one loud doorbell at 4kVA.

I suggest that you get a qualified sparks in to have a look - there are some worrying signs here.

Considering that you have a dual RCD board it would be prudent (not essential, but wise) to have the lights & sockets split so that half are on each RCD. Also prudent that upstairs lights & downstairs sockets get combined on the same RCD (and vice-versa). This minimizes the disruption if if one RCD trips.

100% this please get this mess of a board checked by a qualified & reputable electrician who will be able to fix your lighting issue also. The way the board has been installed stinks of DIY or other person who did not know what they were doing.

Just to add to above, why are all the "heavy" loads hanging off one of the 63a RCDs whilst the other RCD probaby has a maximum demand of less than 10% of it's rating? Why are all ring final circuits on one RCD? Why are all lighting circuits on one RCD? Why has one of the securing screws been mashed to within an inch of its life? Also, British General boards are always worrying due to them being about the cheapest boards you can buy & are readily available from all DIY sheds & Screwfix (not that they're necessarily bad boards & that some proper electricians don't use them too of course).

 

[flameport]

iii). PV array is also a B40A. Thats one big solar array if that is correct!

Even worse, it's been connected to an RCD that supplies several other circuits.

If that CU was installed on the last inspection date (September 2015), it didn't comply at all, as it's made of plastic.
The requirement for non combustible / steel applied from 1 July 2015, two months previous.

 

[muffking]

Well picked up.

Dare we ask for the OP to flick the main switch off and open up the board for a photo to confirm suspicions, or is that frowned on?

 

[delmel]

That looks a proper crap board and some incorrect mcb values. I know there is some real rubbish about and especially cheapened mcbs, some these days I would not trust. I would suggest getting someone in to check the whole lot for you. Whoever did the last inspection should have picked up on this so don't use them.