Ok, I got my remote and keyfobs today.
After a bit of tinkering about, I had similar problems with the remote switching the pump on ok, but not turning it off so good, interference maybe......
So, not really being an expert in anything signal wise, I wrapped my pump up in tinfoil......now the remote works like a dream for both on and off operation

Might just be a fluke, but it works for me, can't wait to try it on a full days work tomorrow.
Cheers all,
Gary