Hi there and thanks for the contribution!
Do you have a link to an official document that describes this airspace? The UK airspace is ingested automatically and I suppose this type of airspace is not part of the source dataset. It is planned to import RC model airfields into openaip and generated warning airspaces for those areas automatically - but this will still take some time to go live.
Meanwhile, please send me a link that describes the airspace geometry and I will add it. Out of curiosity, what is your background? Do have experience with RC model flying in UK? Maybe we can have a private chat about regulations etc.
Cheers,
Stephan