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Unfortunately, I’m not aware of any stock brokers as such offering option purchase to retail investors. Usually you can purchase derivative products through private banks HNWI, which they have to assess and you have to acknowledge that you’re an educated investor of some sort to limit their liability.
These things are usually highly regulated, and the amount retail investors purchase are usually too small for them to bother (traders normally want to go for bulk anyway as pricing a trade takes time. Not worth his time even if it’s £10k). That’s why there so many structured derivative products aimed at retail investors distributed through private banks to the high net worth individuals (HNWI).