An elderly neighbour invited a salesman round to quote for some modifications to her bathroom. The first we knew was when she appeared at our door in some distress, saying that the man 'wouldn't leave'. It turns out he'd been in the house three-and-a-half hours, and quoted way, way more than the work she'd originally intended should cost, and when she said she didn't have that much money, he'd reduced it by £2000, and begun drawing up credit agreements to cover the rest. He nearly got her to sign, even though she was saying she didn't want it and was asking him to leave. Even when we got involved and asked him to leave, he took heavy persuading to get off the premises - he was so determined to make a sale he sat in his car to finish the paperwork to put through her door before he left. He'd asked her to sign something to say she wasn't going to sign the contract. Fortunately, she'd panicked and come to us to get him to leave. We'd really like to make a complaint about the salesman's conduct - the neighbour is elderly, and has some signs of memory loss which are being monitored by her GP, and some days she seems confused and anxious. She doesn't want to ask her family for help making decisions and likes to think she can handle things independtly, but this isn't the first time we've found tradesmen in her house giving her the hard sell. The last time, when we mentioned that she had memory problems, the tradesman packed up and left very quickly, but this one practically needed pushing out the door. It's awful to think that companies like this can still take advantage of elderly people. Who am I best to complain to about this salesman's conduct?