Yep, i know, i know but, when we took the car to our local Honda dealer, the technician explained what had happened.
Apparently, the HID bulbs have to be screwed and then snapped into their holders. When the HIDs were put back in after the SVA, the bulbs were only screwed in. This led to the connection between the bulb and holder getting so hot (due to the high voltage arcing) that the plastic part of the bulbs and holders started to melt together :shock: This would explain the smoke filling up the headlamp - a symptom that other people on this board have experienced.
Anyway, the dealer says that we need new bulbs and holders (which have the leads built into them) - they haven't ruled out that we MAY need new power packs, due to the strain that they have been put under, but for now we'll take it one step at a time, as per the dealer's advice.
The good news is that David at Steels has sorted out all of the parts for us (top guy, who seems to be the only person in the UK who knows his stuff about DC5's AND who cares about the customer) and a big mention goes to the importer, Magnum Motors, who have agreed to foot the bill without any hesitation at all - great people to deal with, who did a very good price on our DC5, so give them a try, especially if you're looking for a silver one with a nice body kit on 8)
Parts arrive next week so i'll keep you posted. Thanks for everyone's help.