In reply to jkarran:
These are the actual regulations for high and very high, although I think they might be the same in this respect. The law is often not easy to read, but the list of restrictions and exceptions in the schedules at the back are not too bad:
https://www.legislation.gov.uk/uksi/2020/1105/schedule/1/made
https://www.legislation.gov.uk/uksi/2020/1104/schedule/1/made
The exception to the restrictions on gatherings for support groups is with the caveat that they are a maximum 15 people and are not held in a private dwelling. Notably it defines a support group as follows:
“support group” means a group which is organised by a business, a charitable, benevolent or philanthropic institution or a public body to provide mutual aid, therapy or any other form of support to its members or those who attend its meetings, for example those providing support...(includes to new parents)
So I think it requires that the event is organised by one of the above. It's intended to allow things like NCT to keep running. You can't just get together informally with your friends as I read it. I don't know how easy it is to set up a charitable or benevolent institution...
Post edited at 21:49