I always tip the drivers in India - especially if they have NOT asked me for a job during the journey.

I would give usually give 5 - 10 GBP at LHR or BHX. However, last month, I was collected from EMA having flown in from France, then driven down to BHX, on arrival into EMA, I received a call:

Me "Hello, Down_the_back speaking"
Unknown caller "Where are you?" (almost sounded like my father when I was growing up and late back)
Me "The Airport"
Caller "Which one"
Me "who is this"
Caller "your driver"
Me "Oh OK, am just clearing immigration, I will be out in a minute"
Driver "What you look like"
Me "I have 2 silver suitcases and 3 LV bags"
Driver "Where will you be"
Me "outside arrivals hall"
Driver "well can you hurry, I am here?"
Me "will be as quick as I can"

He came to me, eventually after me being stood for 15 minutes, I pushed the trolley to the car, while he walked under the shelter of his own umbrella, he commented that luggage would not fit in car, I insisted that we could use the seats, he then informed me the seats were for passengers, "would we be picking up other people on the way" I asked!

Arrived at Merc, he opened drivers door, lifted trunk release from inside and sat in drivers seat. I got the majority of the bags in the trunk, had suit carrier on back seat with me.

Listened to his Hip Hop on the way down to BHX - 40 mins, arrived at BHX where he grunted that I had to give him 6 pounds for the trolley. I glared, got out the car, paid 2 pounds for the trolley took the bags out of the car myself, and walked off!

Needless to say - he received NO tip.

Drivers in Dubai get 20 Dhs per ride unless I have to give them directions! I had one driver who had only been in Dubai 3 weeks and admitted he did not know where anywhere was. This is the fault of Avis - not his fault! However, I did not tip him....