They did my road on Saturday, I was driving home and saw a group of maybe 8 or 10, mostly teenage girls standing on the corner. They finished the long road 20 minutes later so clearly no-one was interested. It's the first time in years I've seen them though. I used to get mormons call more frequently or charity workers wanting donations which is probably quite unusual for the UK.
In my old territory we used to cover it consistently every 6-9 months for 20 years, however given that not homes were done twice, it might have seemed as though we called every few months.
mmxiv