Oh dear Kate I'm sorry to hear about another A5 catching fire.
Glad no one was hurt though that's the main thing!
Sadly, you're not the first person to report this on our forums, have a look through and add yourself to this thread as it's good to keep a tally of how many people have been affected:
http://www.audiownersclub.com/forums/topic/4607-a5-fire/?page=1
Did you manage to get any photos of it whilst it was on fire?