Buying and selling Crypto

I have dual citizenship and have purchased bitcoins abroad which I now wish to sell in the uk. The current value is almost the same as when I purchased them around £12,000. Any gains from the current sale would be very small if any, more than likely after fees I will actually have lost money. Those have not been held for very long. I am unsure if I would need to pay any tax or fill any forms in to declare the sale. Could you offer any advice

Hi Matthew,
Please refer to guidance at:
Capital Gains Tax: what you pay it on, rates and allowances
Thank you.