In addition to showing my passport, what else can I use when checking into a hotel in the UK?

Whether a specific hotel requires a passport, you have to check what your booking says. If the booking does not say that you need to bring a passport, there is no need to bring it. If he asks you for it, just show yours. Just make a booking. If he asks for a passport, just tell him that he didn't ask for it on the booking page, so I don't need to bring it with him. Just be tough. If it is clearly required in the booking, you must bring it. If you don’t have a passport, a driver’s license is fine, but a copy or student ID is not.

I have stayed in the UK for more than 10 years. According to my experience, most hotels do not require a passport, just the booking paper. All the 3-star hotels I have stayed in have not asked for it. (Liverpool, Birmingham, Stoke City, Manchester City, etc.), but almost all 4- and 5-star hotels ask me for their passports, especially hotels in London. Almost all of them ask me for their passports!

To be on the safe side, it is recommended to contact the hotel!