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A board change and all the testing in 3 hrs :lol:

As Andy said above, it will be the PRD usually caused by shower head holes blocked / partially blocked by limescale.

Which fuse blows, the one in the plug or the one in the consumer unit?

Will a 10mm cable be OK for a 10.5kW shower if the cable is to be installed in conduit?

The insulation is removed to allow adequate airflow around the light fittings to prevent them over heating, but as you say you are losing heat around them and more importantly allowing moist air from your bathroom to enter the loft space. Even LED lamps run hot so will require a good sized space...

A picture of the wiring would help, but it sounds like they are connected in series rather than parallel.

Any make will be OK to replace it with. The biggest problem will be getting one where the water and wiring entries match up with your old unit. Tiles should go behind the shower not be cut around it.

I don't think there is anything in the building regs but there is something in BS 7671 which says about gangways around electrical control gear. I don't have my copy with me at the moment so can't give you references but if you post on the electrical forum I am sure someone on there will tell...

Forget the connector and just connect into the back of one of the existing sockets.

You could try one of these. http://www.alertelectrical.com/prod/1022/click-45a-easyfit-dual-appliance-outlet-plate

ivixor, where abouts are you in Cambridgeshire? If you are near Peterborough I may be able to help.

It is also worth having it switched from inside to stop other people using your electricity if the socket is accessible by neighbours etc.

What earthing system does your house have?.

You will need to consider RCD protection for the new shower.

You say you have put all the cables into connector blocks then ran singles to the board, do the tampers not need to be wired in series rather than parallel?

I had the same problem a couple of years ago, it was easier and not that expensive to swap out the complete fitting for a standard sized one.

What do the manufacturers instructions say?

Red wire on left in second picture had indent in it which looks like you nipped it with the face plate screw.

If the cable is only 10mm across then it sounds like 2.5mm2 cable which is no where near big enough for your new shower. You need an electrician to upgrade your feed to the shower and provide you with RCD protection.

When you say the cable is 10mm is that the measurement across the cable or is that what is written on the grey outer sheath?