Update on the condensation battle. Seen on internets that I can evaporate the remaining water with hairdryer through bulb hole.
Commence drying after removing the battery, only to see a little ripple of pooled water in the bottom of the lamp.
No problems I'll just poke a rag through with a spanner to soak excess up, drops spanner into the headlight assembly. Cue much swearing and having to take the grill off snapping some clips along the way to wriggle the lamp enough to fish the spanner out. Finally after much cocking around I now have a dry lamp :-D