There are some places that forbid tips for their staff. El Corte Ingles used to do that, I don't know if they still do.
Interesting that some get the impression that the Spanish (in their town) don't tip. I can't say they seemed to be big tippers, but it was normal in Madrid cafe-bars to round up the amount paid, normally small stuff like 12 or 15 centimes. I sometimes saw people leave a 50c tip after eating a menu, but that was rarer.

I'm amazed no one has mentioned the term "Bote", Spanish for pot.

In most places I have seen where tipping is common there is a pot or bote behind the counter into which tips are passed on by staff to be shared out later I presume.

It is common for tips to be handed over the counter, para el bote, but occasionally given to waiters, para el bote.

Yes, a place we use, they throw it in the pot, ring a bell and shout ¡¡¡¡bote!!! Very loud!

I sometimes think I'm living in a rich area, which is untrue, but the Spanish people I know do tip. I took shelter from the torrential rain this morning in a Spanish cafe I don't normally use, and squeezed on to a table with others sheltering from the downpour, Spanish people.

We all left a tip for the waitress.

Exactly.

I wonder if Cman and Stevie are a just a little mutton jeff or just never got round to finding it on google.

It's more a Med resort thing ime, but I think I've seen it in at least one Madrid bar. Not the norm though.

Yes I have come across that in Corte Ingles but now just leave the tip on the table as I walk out.

I was always told that leaving a small amount like 5c / 5p was to insult staff who had given poor service. This of course is dependent on the cost of the service, i.e. not for a cup of coffee

Well I was referring to those who had only had 1 (or at most 2) drinks. I never saw a tip of 5 or 10C left for a coffee or glass of wine as being seen as an insult - I can see it being the case if the customer had ordered a meal though.