We may have an issue of semantics here. We were looking at your (very nice) old bikes and kit. I was inquiring about the forks as they were the old Pace Magnesium ones and I was wondering if they were any good. You said you weren’t sure if they were still working, but that I could buy them for £20 if I wanted. I demurred. You said, tell you what, take them and if you can get them to work properly chuck me £20, if not don’t worry about it.
Now that’s slightly different to “On approval” which would mean me returning them if not happy (which would cost me that in postage or in petrol to drive to Leeds) which I wouldn’t have agreed to.
But look, no hard feelings either way, it’s certainly not worth getting into a dispute about, if you want the £20 for them I’m happy to sort it out.