Would anyone advise me on my use case?
I am launching a paid service and would like to offer the option for customers to pay in crypto. I would likely want to regularly convert the crypto to GBP for day-to-day spending at the supermarket and suchlike, rather than hold it as an investment or trade in it. It will likely be fairly small amounts at a time and therefore low-risk.
What would be the easiest way for me to do this?
If you want to accept any crypto and swap for fiat then most likely a commercial payment gateway is what you want. https://cryptomus.com/gateway or https://www.coinpayments.net/
You could also set up a non-custodial payments using Bitcoin Cash where the coins go to you. Bitcoin Cash is the future of money and will eventually replace fiat. In about 15-20 years. https://minisatoshi.cash/merchants