Took it to my local indy in the end. They replaced the bulb with the headlight unit on a bench. Annoyingly though, the same bulb has gone again 🤬.
This time, I thought I would go to Skoda Dartford and have them do it, for peace of mind. However, it turns out they have less of a clue than the posters on this thread. The technician insisted the bulb was seized, and we had an argument about how it came out. My car has the retaining clips. He was trying to twist it. He bet me a million pounds too and was a bit more humble once we both went over to the car and I showed him. Don't think he'll pay the million quid though. I said I knew how to do it as I'd read the workshop manual. He said "oh, I don't read those"!
Having taken the car to Skoda for the expertise (it certainly wasn't for the price of the £140 bulb!) I just left after that. They are clueless. I'll go back to my indy.