Thanks for the quick reply.
Correct me if I am wrong, the running lights must surely be the DRL's, i.e the two front daytime running lights not the two rear side lights which do not come on with the front DRL's but come on when the dipped beam headlights are switched on?
That said, from what you say the bulbs may be on the way out but are still working at the moment, so I will just keep an eye on them.
I have just noticed that I didn't actually say in my first post that neither the warning triangle or scrolling message come on when the DRL's are on, only when dipped beam [and rear side lights] are switched on.
Keith