Yes, she paid. It just took me a long while to say that she'd paid due to the moderation.
When she got back from the cash point (she said cash point, but she paid me in old notes and 5x £1 coins, so I don't know where she'd really been), she gave me the cash and slammed the door.
When she phoned later to say that she'd reported me to trading standards, she said that they'd told her that she shouldn't have paid and also said that she'd phoned her husband who told her not to pay either. I thought at that point that she was going to ask for a refund.
Really, I don't think she spoke to trading standards because if she told the truth they'd have asked her why she thought she shouldn't be paying a bloke who came to her house and tested her circuit like she'd asked.
I've nothing to hide and know that I didn't mislead her, which is why I was open about it and gave her NAPITS phone number and my membership number for her to make a complaint there too.
Lesson learned though, like so many have said in this thread, I need to make it painfully obvious when I'm charging and when I'm quoting. I've updated my FAQs and T&Cs and have added that they should be read to my advert that I've sent off to the local rag to update today.
Nearly there, this is number 8 of 10 posts before the moderation is lifted.