The fuel thing is complete bollocks. It's been debunked numerous times, notably by TV series Brainiac who refuelled a car whilst ringing about 100 phones inside it. A fire requires fuel, oxygen and a source of ignition; a phone is none of these.
The CAA claim to have evidence of instrument interference, but it was noted that the phone has to be practically glued to the panel in order to manifest anything, and that only miniscule deviations were noted. I've personally tried using my mobile in the air, and apart from the odd little pip in the headset it did nothing. No instruments malfunctioned, ILS was rock solid, complete non-event.