PG03WRX

ok so I parked outside a shop on double yellers to get some pasties,came out of the shop and my car wouldn't start.the key fob wouldn't work,the radio came on,but it was as if the battery had gone in the fob,
I rang a mate went home got the spare key and fob,read through the alarm manual,went back i had a ticket.£70,
In the manual it says you can override the imobiliser buy entering a four digit code,i can't find this code anywhere?
so i tried the other key still no joy,went back home got my towing bar got back to the car and there is no towing hook on the front,
I rolled the car of the double yellow lines tried the key again and it started?

Is it possible soming was jamming my signal from my fob?