"Three on the bell" to stop the bus, slowly just to stop, quickly for an emergency stop.
I'd have to say that not all Leeds City Transport crews had the same awareness of customer service that is normal today. In my student days, having caught the 72 in the middle of Bradford, the conductor stopped the bus in Stanningley and accused me of passing him four Channel Islands pennies. (Possibly Jersey, but I'm not sure.) I could imagine one by mistake but four would have to be deliberate. No choice but to pay up. That was mid-afternoon, BTW. When I recounted the story the following day, I had no problem getting somebody to have them as collectors' items. They are not exactly foreign coins.
A couple of years later, I was working nights at Dewsbury Road and a bus to Miggy pulled up outside the nick with a long blast on the horn. Junior man so off I went across the road, trying to look bigger than my full 5'8". The bus was packed with people on their way home from pubs etc., in town and the conductor announced that there were two upstairs at the front, refusing to pay and the bus would not be moving till they were both off. The front of the upper deck of a rear entry double decker isn't the place to practice martial arts but up I went, expecting at any moment to be under kicking feet. Nothing like that and when I reached the "miscreants" they were two young lads, ten to twelve years possibly. Anyway, off the bus they came, very meek and mild as you might expect and the obvious answer was a lift home. Into my shiny new panda car (no Z Cars tune, unfortunately ) and straight to Miggy. Their mum was furious as she had always drummed into them that if ever they were stuck without their fare, they should give their name and address. They'd been on some sort of trip and ended up back in Leeds without their fare, mum had been worried etc. More to the point, she knew the procedure about names and addresses and also that bus crews should not leave children stranded. I think she was either a union official or employed at Leeds City Transport. Either way, she was not best pleased. (If I've recounted this tale on here before, sorry.)
Re the night buses, I can't be sure if it was every night but I think it was. My memory is of one bus an hour, on perhaps half-a-dozen main routes. Definitely double fares.