The reliable way to hire a tradesperson

I want every skirting, radiator, window frame, door frame in each room to be the same colour as the walls but each room is going to be painted different colours. What type of paint should I use for either all of it or what clear overlay should I use for all rooms so my cost isn't extortionate? I am painting it myself on skimmed walls.

Hoping for some advice as I know very little about roofing. I live in a top floor flat and in November after some very heavy rainfall I noticed a wall in my living room (which is a party wall) had a damp patch. This disappeared after drying out and I never saw it again - nevertheless I reported it to my Residents Association and they had some roofers take a look. They suggested that the section of the roof above my flat will need to be replaced costing £4k. Fast forward to March and the work was finally completed. After one period of rainfall I find that my living room ceiling is dripping water and whatever work they have done on the roof has essentially made the whole thing worse. The contractor came a day later and was "99%" sure that he found the issue which was some kind of fixing that wasn't fitted properly. He was here for around 10 minutes and said I shouldn't have the issue again. Fast forward a couple more days and my living room ceiling is leaking against straight after further rainfall. Again, messaged the contractor and he has (without further inspection) said he's now "99%" sure it's an old chimney that "is on the roof of the next block of flats but the edge meets my roof". Apparently it's covered in old felt and this is where the water will be coming in as my whole roof is apparently air tight. He's now coming round again shortly to cover the chimney stack in tarpaulin and if when it rains I get no leak then that's the answer. He's used a rubber covering which apparently has a 10 year guarentee for this work. My questions are the following: - Is the layer of the material below the rubber now compromised because it's dealt with two lots of rainfall? - At this point is it reasonable for my Residents Association to ask for a full refund? (£4k) I no longer have confidence that whatever work has been completed is able to withstand the test of time if after a few days I'm already experiencing a leak. My living room ceiling is ruined as a result of this and I'm pretty annoyed about it all especially as I've had no say in who completes this work - any comments, recommendations or advice is welcome. Thankyou

Guys can you advise easiest way to put rodent metal Eaves Combs under tiles please. No experience removing roof tiles Also if only first/bottom row do they need to be screwed/tacked back into place? If so how do you tack them. TIA