Solar PV and water ingress through the roof - any advice?

I had solar panels installed on my roof many years ago (I should have records but can't find them, but I reckon it was 2006).  Some salient points:-

* It's a three storey house.
* The panels are on a south facing roof at the rear of the house.
* My kitchen is on that side of the house.
* My bedroom in on that side of the house.
* There is a balcony above the exit from the kitchen to the garden on that side of the house.
* EDF did the work (or at least were responsible for sub-contracting it out), and they're the ones who buy my power.

I've had various water related issues on the ground floor eg:-

* At least two instances of water getting in and dripping from ceiling light fittings in the kitchen.
* Persistent damp in one corner of the room immediately adjacent to one corner of the balcony.

Because of the adjacency of the damp and the balcony I assumed that the problem was the balcony.  I've had it resealed and reflashed twice.  And the corner of the kitchen has been damp proofed, stain proofed and repainted at least twice.

In my bedroom, on the top floor, I've had persistent but basically benign (if that's actually a word you can use in this context) issues with water staining in the ceiling plasterboard.

At one point I called EDF to ask them about this and they said "solar PV installs don't go through the roof, you'd need to get an accredited builder involved and they'd need to put scaffolding up and get a crane out etc" which, not surprisingly, I found rather off-putting.  I should have kept a record of this conversation.  I didn't.

I had the whole house redecorated at the start of 2020 and the staining in my room and the damp in the kitchen returned with the next heavy rains that occurred.  With the incredibly heavy rains we experienced a few weeks ago something new happened.  Water came out of the plaster / wall in my room in a new place.  One that happens to be directly above where the damp occurs in the kitchen on the ground floor.

I got twitchy enough about this that I asked my builder to get in and see what he could do from the inside.  He completed this today and found a) loose tiles, b) an unsealed bolt coming through the slates going straight into a joist, bolting the panels in place, c) water entering via this bolt, hitting the joist, running down to the angle of the roof and the wall, and then going wherever it wanted to ie across the ceiling in my bedroom, but also to the cavity in the side wall that runs all the way down to the kitchen...  Oh, and yeah, one of the horizontal joists has basically rotted through.

The good news is that he's confident he's fixed it up, and that it won't cause problems going forwards.  Which, if nothing else, avoids a bill for scaffolding, crane hire, "expertise" etc that would have run into the thousands.

But I am more than a little miffed with EDF.  How do I approach them, and what sort of recompense should I be looking for?