John let's recap, your engine went dead, Rac came and reset it (I assume thats reset the DTC's) it started up and ran ok then died again several weeks later.
Do you recall anything the RAC man said at all?
Does the engine turn over by turning the key? if so would you say it turns over at the normal speed the engine turns over? or slower?
Did the RAC man do anything else you noticed? like say connected a battery booster or something?
Does the little yellow light with the car on the clocks go out after 3 seconds after turning your key to ignition?
Does the engine 'try' to fire up at all?
If it 'tries' to start and then stops with the yellow light with the car on the clocks flashing or staying on, have you tried your spare key?
What is the warning lights your getting on the clocks? Sorry about throwing questions at you but we need to try to narrow fault down, as its too vauge and can be anything at moment.
Cheers
SARGE