How old is your motor? If it has done 34k miles it will depend on when the last regen was done, they normally happen every 500ish miles. If the regen light is on I would take it for a decent run and don't let the rpm fall below 2k. Normally about 20 miles/minutes.
No it never came from a vauxhall dealer but did come from a garage so it will be going back! Just really annoying, it's not really affecting the fuel usage I'm getting around 38 mpg. The rev counter needle also "bounces" when idling now and you can feel the engine hunting. But when out on the road the car seems to drive like normal but there's a smell of fuel when sitting still with engine running.