October has been Black history month in the UK since approximately 1987. In the earlier years it was simply individual councils acknowledging achievements by the Black community in the UK and abroad. It has grown over the years and continues today.
You can read up on Black history in the UK from the following websites
Of course there are many many more resources out there and books too but these are a good place to start exploring the topic. You don’t have to wait for specific time in the year to begin reading your history.