Martha Stewart Fringe Cutter

Aria has been great with fitting a new shower and rearranging some pipe work for us. He was quick, approachable and even highlighted that the shower manufacturer offered a cheap installation (we didn’t do this in the end as needed something else done as well). He was able to complete the work soon after his initial visit. Would recommend!

Yes but the point of saying "through" or "thru" is that it unambiguously includes Friday!!! "Monday to Friday" might or might not include Friday. "Monday through Friday" very clearly does include Friday. Nothing wrong with a useful expression that just happens to come from America, surely? Much of our modern language does originally, just as much of their language came from us originally. Times change, and all that ....

I'd say sending them  the affidavit and offering them a full refund for the return of the machines is a great idea. By far the least hassle for you, and will put them on the spot if they have been telling lies. If you end up having to give them the refund, you will be no worse off than you were before the sale (assuming they don't damage the machines, of course). But I know nothing about the legal issues (if any) around all this. Citizens Advice might help if you run into further difficulties? Good luck! 

The point is that these door to door sellers are doing it under false pretences, and claiming to be part of a project that doesn't exist.