Originally Posted by chewy
Wouldn't a couple of CB's do, of course you'll need a license for these to.
Handheld CB radios are not widely available anymore since OFCOM released the UHF 446 PMR frequencies. A well known store have a twin pack of Motorola's for £25 at the moment and a quad pack of Binatone for less than £60.
Although the UHF 446 PMR system has only 8 channels, each channel can be split into sub-channels (using CCS tones) so only radio's set to a partic channel AND sub channel will contact each other.
Again these are public frequencies that anyone with similar kit can listen in or even talk back to you, if you want someting a bit more secure, it gets expensive.