How can I buy Usdt in UK?

I'm interested in purchasing USDT in the UK, but I'm not entirely sure how to proceed. Could you please provide a step-by-step guide on how to buy USDT in the UK? I'm particularly interested in understanding the different methods available, such as through exchanges or brokerages, and the associated fees and risks. Additionally, I would like to know if there are any legal requirements or regulations that I need to be aware of before making the purchase. Thank you for your assistance!