A group of 4 of us were in London in September 2023.
Initially I was determined to NOT use the tube. Guide books said taxi prices were comparable to the tube for 4 people. And I was worried about climbing all those stairs in and out of the tube stations - I have difficulty with stairs.
Well, The London cabs were very good having room for 4 people even with a lot of luggage. But we found the price escalates when traffic is slow. And we had frequent evening rains which can make cabs impossible to get. (Even Uber and Freenow offered no magical solution.)
After a long wet walk back to the hotel one night, the next night of rain we ventured onto the tube. Used google maps to tell us which station and line to use. At first I confused Victoria station and Victoria line. But with help realized we needed Victoria station and District line.
The tube was great. It lets you enter and exit with just a credit card. The stations we used all had escalators or elevators. No wait for the train. And not too much of a walk on either end. I will definitely recommend the tube in the future.