In short, looks like a family member has been ripped off by a rogue trader - visited elderly relative, took money and never came back.
My Mrs wanted to get them round to ours to corner them about it.
I said bad idea you don't know how they'll react and future ramifications etc, she said I was a whimp (nice).
She has now (under my advice) contacted trading standards and they've told her the correct way to address it.
Don't get me wrong I want it sorted but I am right aren't I in terms of not confronting them? At the end of the day I'm more worried about my family's safety than I am in getting £50 back.