http://www.firstpersonview.co.uk/blog/quadcopters/caa-meeting-update-fpv-exemption-extended-to-3-5kg-auw-and-1000ft-max-altitude-from-march-2014/ The new ceiling is particularly cool.
To put it in perspective, when considering the unlikely scenario of hitting a full sized aircraft, a fully grown male goose weighs twice as much as the 3.5 kg top end AUW for this exemption. Most FPV setup are nowhere near that weights, often below 1kg - or 1/6th of a goose. I know it sounds silly to make such a comparison, but the CAA will have this in mind, comparing FPV setups with other aerial hazards totally out of their control and without the means to avoid flight paths.