No, I know my limitations, London Flower, and taking bricks out to expose a colony in a cavity wall is not for me. One, it's too much like hard work. Now, the garage roof would be simple, but again hard work for what you would get out of it.
Had another one today in a flat roof on a 1970s bathroom extension. I did go and look, as the guy convinced me that the past few stings he has had from the bees in this colony, his reactions have gotten worse and his doctor wants more tests to be done. He has a range of bee friendly plants and a number of different types of bees living within his garden, which was his plan.
This colony was very busy and I got the impression that it was a big one. I don't normally talk about the destruction of a colony but in certain circumstances, I feel it can be necessary. At this present time he does not have the money to spend out on a new roof, so has found a pest control guy willing to destroy the colony. He wants to think about it further and discuss with his wife, but if he was to ask me and was willing to pay expenses I would remove this for him. There is building work going on next door and the builders who have been stung several times are willing to pay half his cost for pest control so think the pestie will get this one.