Remote control caravan movers

Does anyone else have problems with remote control caravan movers? I use Caravan Club sites all over England on my travels each year, and have no difficulty with controlling movement of my caravan using my power mover's remote control anywhere- except at Cambridge Cherry Hinton! When I go there, I have to use the alternative direct cabled connection to from the remote control handset to the caravan- yet other caravanners around me have no problem. I was at Cromer Incleboro Fields last year, I had no problems, but the caravanner on the pitch next to mine couldn't get their remote control to operate. Strange. I wondered if my problem at Cherry Hinton is due to interference between signals from my remote control and local radio waves- I think there are various masts on the hill above the site- I presume each power mover remote has to have a separate signal wavelength or frequency to avoid accidentally operating other people's movers, and it just unfortunately happens that the signal from my mover clashes with something local.