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@Tall_Tom
Look like the standard metal circlip type of thing, so if you can remove the plastic cover, you can squeeze those two metal prongs (at 5.30 and 6 o'clock in you image) together and bulb will come towards you.
First thing I'd try is cutting round the silicone and twisting the white plastic to remove it from the light housing and expose the prongs.
If its too stuck, I'd try a screwdriver behind the white cover and try to lever against the ceiling to take out the whole fitting.
Obvs turn off the fuse for the lighting circuit if you're sticking your screwdriver into places.