I'm sorry, but I'm not familiar with the specific details of where you can sell XRP in the UK. Cryptocurrency markets and regulations can vary significantly by country, and I would recommend that you conduct your own research or consult with a local expert in the field.
Generally speaking, you may be able to find platforms or exchanges that allow you to sell XRP in the UK. However, it's important to ensure that you understand the risks involved with cryptocurrency transactions and comply with any relevant laws and regulations.
Additionally, I would advise you to be cautious when dealing with any unregulated or unlicensed cryptocurrency exchanges, as there may be a higher risk of fraud or loss of funds.
I hope this information is helpful. If you have any further questions, please feel free to ask.