I had put the customers price up by £1 still very cheap as he is a friend of a friend (£5 cheaper than his neighbour), after an email to remind him of payment due he sent a bac's payment at the old price, I emailed him to tell him this and said I would put it on next bill, he replied that money was tight and he would be doing his own in future, he has a good job with bt and wife works as well, his window cleaning bill costs him less than a £1 a week.
I would be interested to watch him clean his own windows as there is no way he will be climbing a ladder or getting on his flat roof, as he is about 28 stone, I wonder when I will get a phone call to return.