It,s simple supply and demand aviation has thousands of wannabes who have trained them selfs trying to get in to a job , but you try to get hold of some one to fix the roof on your house !.
I dont see a line of highly motivated builders looking for work so the £55,000 must be what it takes to get the staff that are needed.
Please dont think that just because you are a pilot you should be paid more than a builder , the capitalist system just dont work that way !.