Clearing tables--what is customary in fast food establishments?

Location says UK.

It sounds like he's talking about a specific establishment, and I think we've proved that the UK varies widely by region 

think we've proved that the UK varies widely by region 

Have we proved this?

Have we proved this?

On this particular subject or in general? Anytime someone says a variation of "Brits do X" twenty people pop up to say that none of the Brits they've ever met anywhere in their lifetime/20 years/3 days of living in many/some/one class/geographic parts of the country have ever done that.

It's normal here for a waiter or waitress to spot you've finished with your stuff and come over to take stuff away to clean up,

What fast food places have waiters or waitresses?  Waiter service kind of defeats the point of fast food.

I worked at the Waffel House as a waitress, it's considered fast food. 

I don't know if there is any specific rule to fast food busing. I think it's all a matter of how lazy/in a hurry/etc the person is. I notice some people throw their food away and some people just leave it.

My take on it is that if there are workers whose job it seems to be to bring things to tables and to take things away - and they are wandering around from table to table looking for leftovers to clean up - then leave it for them to pick up.

However, if all the workers are busy taking orders/preparing food (what I consider a real fast food restaurant because if you are truly in a hurry you don't have time to wait for servers to bring things to you), and your trash won't get picked up until a worker manages to get a break from their real job - then dispose of  your trash yourself.

I just take my cue from the bins around the room.  If there are obvious clear up bins in multiple locations (like McDonalds does), I clear up my rubbish, if there aren't bins around (like cafes often do) I leave it for the staff to clear up.

It's better than an Italian ice cream shop or bakery....you go in and fight your way up to a class-fronted counter, choose an item, find somebody to order from, get a slip of paper, find the register and fight your way up through the mob and pay for teh item and get a receipt and then go back to the original mob and fight your way up again and present the receipt and get your stuff. Then you find out you have to pay extra for a table....but it is fun...

My aunt always leaves her shopping trolley in the parking lot of the supermarket (whereas DH would scrupulously take it back to the store). Her thinking is that they pay people to round up the trolleys -- and maybe the kid whose turn it is to do that likes the chance to get away from bagging.