Any ideas?

[Mark]

Hi to everyone especially A8 doc as I'm still driving around in your old A8 4.2 D3 LPG (143k miles and counting). I don't post much or even lurk but I do think the A8 is an absolutely superb car( d2 and d3 ,although jury is still out on the latest!). However mine has been playing up recently and I can't fathom it out. On cold starts it sometimes doesn't even attempt to turn over but if I go back to it 5-10 minutes later it fires up fine, although sometimes with a noticeable delay after turning the key. Any thoughts ?
On a second note to all of you on LPG do you realise the channel tunnel won't let you on? I found this out a couple of weeks ago as we were due to take the kids to Disneyland Paris but sea France went into administration and had to do the journey in the 110 defender which makes you appreciate the A8's ability even more. Cheers Mark