engine disabled. !!!!

just wondering if anybody else has had a similar situation? fuelled up with lpg at my local morrisons station in blackpool a few weeks ago and returning to my car i turned the ignition key and dashboard message read "engine disabled" , im not saying i panicked but i didnt tell the wife.. Turned key again, car fired up no probs. Just last week, fuelled up again, same place, car started and drove to a fast food gaff very close by.Mcdonalds actually, cheese burger and fries all round, anyhappen, bought food, returned to car and again, same message, this time fired up on the third turn of the key. Now my worry is that the engine may have been affected by the radio signals being sent out from blackpool airport, i have heard this can play havoc with the electrics. Is this possible, and has anyone else sufered here or near radio masts or airfields?
its a 4.6ltr hse if that makes any difference,

yes i get it all the time if you move your car a few yards it will go out, yes it is picking something up if you not got your eka code get it befor you get stuck..