I contacted Allen as we had bought a house with a badly installed boiler that was displaying a number of issues.
We asked him to basically do what he good to improve the situation without us having to fit a new system. He quoted us for some repairs but was very honest that he couldn’t 100% guarantee that he could solve all the issues. We decided to have the work carried out, which happily appears to have solved most of the problems with the boiler.
He was very responsive too, we didn’t have to wait ages for him to come and do the work. We’ll definitely recommend him to others in the future.