I've had a few clients manage to be both early and late for the same booking, I send them off somewhere a 3min drive away with instructions to come back at the time they booked and some just don't? Or come back 10mins late with an attitude but their session ends at the agreed upon time if they're late and when they've had the time paid for if they're early (Heads, I win! Tails, they lose!)

Yes, I get both of those. They turn up ten minutes early so I tell them to walk round the block or something, then the hour strikes and they're nowhere to be found (then when they do ring they don't listen to directions properly and lose another five minutes of their time). Even more irritating is when they try to make it sound like they were 'giving me' more time as if I was running late when I was bang on schedule 

The worst for me is when they get a taxi and don't pre-warn me. Obviously taxis are a law unto themselves in terms of timing and if they're early they can't wait in the car. There's nowhere sheltered and out of the way for them to chill til the appointment time so I always suggest a nearby bus stop for those coming by public transport if the timings don't line up. It's very rare that they communicate this kind of info to me though

I have lost more money thanks to idiots in taxis in the last few months than for any other reason, and now if they mention they're travelling by road I ask where they're coming from and refuse to see them if it's more than ten minutes away.

One decided to come from Paddington (the other side of the city) in an 'Uber' during rush hour when he could have got here on the Elizabeth train in twenty minutes. The bellend was so late I had to cancel him after I waited 45 minutes, so that cost me an hours' pay just because he was a public transport snob.