I am just up the road from you and have worked the area that you are located in and what I have suggested worked for me for over eight years.
Two more suggestions that work.
I was walking down a street and saw a young lady washing a car, soap suds every ware, I teased by putting up my camera feigned taking a shoot, asked if I could take a better picture and she agreed, took two prints down to her two days late with my details on back, nine months later I got a call asking me to do her mothers wedding, paid handsomely as she married a Lebanese businessman.
Plus sow some seeds, my brother is well known in the boxing fraternity and regularly goes to professional gyms and shoots images of all the boxers and family's that are there, hands out copyrighted images.
Only insisting that they use his images on any promotional posters = income. and the boxers know him and his work. he regularly sees his work when these people give interviews from there home.
Go out and sell yourself and you will get your rewards.
Another thing that has just crossed my mind thinking of the security your customer has, as they already know what the workman looks and acts like before they let you in to do the work.
Not going to work selling replacement glazing units though! At least read the OP before commenting