> Unfortunately the law in this area is
> very grey and almost universally ignored
It may be ignored, but it is not grey. Listening to aircraft or ATC transmissions via a scanner is illegal. Scanners can be sold openly because selling or possessing one is not illegal; the law merely applies to the use of the device. The WTA is a wonderful exchange of a laws that make everthing illegal by default and then makes you beg the government for permission......