[Tannaton]

Agree with everything that has been said.

We call them "bulb" because the traditional light bulb was "bulb" shaped but the correct terminology is lamps. Lamps have a finite life and thus like wiper blades, brake pads, etc. are consumable items and excluded from warranties (except by Jaguar, interestingly... who cover HID bulbs in their 3 year warranty).

However I think it is clear from your description that the failure you have is a mechanical or electrical failure of the headlamp unit (or "luminaire"). This should be covered buy the warranty - it is the same principle of saying your wiper motor is not covered because wiper blades are consumables.

Personally I would bypass the dealer and go to Volvo UK Customer Services. It's shambolic that you should have such a frustrating time wasting experience with a premium brand.