<<but all you guys who trust GPS without raw data back upwatch out for Johny radio ham.>>
As a long-time licenced radio amateur I take exception to that and subsequent similar remarks.
Radio amateurs are responsible individuals, many of whom are at the forefront of radio technology. Radio amateurs can, and do, legally operate on frequencies well above those employed for GPS and I would be surprised if any of those experimenters caused problems.
It's certainly possible to obtain equipment which could causes problems because policing of the radio spectrum in thge UK is almost nil and there is little control over the sale of transmitting gear.