Having just got my new boat launched yesterday Sunseeker Monteray), and sea-trialled it, I will be going out and about in the Solent during next week. I'll take some photos of all the buoys and markers I can find and post them here if that's of any use.
In the Solent, it is plagued with small brightly coloured balls and so on that mark lobster pots and crab traps. These tend to be placed in any waters of about 15 metres or less depth. I'll take some snaps of those as well.