Well, HMRC can tell you all sorts of stuff, and much of the guidance is not very good - hence the questions which they are not able to answer. I expect a lot of it will develop through casework. It is important to have a good accountant, though.
I'm not aware of any restrictions on how much you can hold (at least one person or entity is holding £7.0M of crypto, a massive jump from the highest holdings of the previous year), but there is a little questionnaire you have to answer before you can buy/sell - more to make people aware that crypto is unregulated and high risk and don't put your house on it.
Actually, London has the largest blockchain industry outside of the States and the last government were keen to promote it and attract more investment, especially after losing so much of the financial services sector after Brexit.
Great that you've made the connection with macchiata. My own ideas won't be starting until later in the year/next year as I have other things happening. Maybe by then the DHF will have settled down. Let's see what happens!
RE: Value Plan Q4 Proposal + General Information