a couple of my custies got it too (Surrey) , the point is that if you have a window cleaner or dont want one then you would hang up automated or not but if you need a window cleaner then people most probably would say yes , i would.
The customers that recieved these calls say there wasnt a company name being mentioned so that would mean to me that it was a canvassing company doing it which would make sense , i think it is a good idea , only drawback is that the calls would have to be on bought lists of contactrs