What is the HMRC disclosure for crypto?

Could you please explain what the HMRC disclosure for crypto is? I've been hearing a lot about it recently, but I'm not entirely sure what it entails. As a professional in the field of cryptocurrency and finance, I'm sure you'd be able to provide a clear and concise explanation. Could you please elaborate on the importance of this disclosure, who it applies to, and the potential consequences of not adhering to it? I'm particularly interested in understanding how it affects individual investors and businesses dealing with cryptocurrencies. Thank you for your time and expertise.