How do I sell XRP for GBP?

Good day, I am new to the world of cryptocurrency and I am hoping to gain some clarity on a transaction I am considering. I currently hold a significant amount of XRP and am interested in converting it into British Pound Sterling (GBP). Could you please guide me through the process of selling my XRP for GBP? I am unsure of the best platform to use, the exchange rates I should expect, and any potential fees or taxes I may encounter. Additionally, I would appreciate any advice on how to ensure the security of my transactions and protect myself from any fraud or scams. Thank you for your time and assistance.