Is USDT legal in the UK?

I'm interested in cryptocurrency and I'm considering investing in USDT. However, I'm not sure if it's legal in the UK. Could you please provide some information about the legality of USDT in the UK? I understand that cryptocurrencies can be a complex and unregulated field, so I would appreciate any guidance you can offer. Additionally, if there are any specific regulations or legal frameworks that apply to USDT in the UK, I would be grateful if you could provide more details. Thank you for your help.