Okay - clarification, especially for 'split'. OP said '..
.The last couple of years I have managed to get out of the airport without paying the £1 tip for having my bags snatched off me....' There is no such tip. Report any individual demanding such bribes at your first point of entry to Goa as the cheats that they are. They are preying on your innocence and tiredness, and many will try and demand a great deal more than 20/30 rups, cause they read you, your luggage, destination, status and fatigue in a millisecond.
I gave advice. There is
no reason to pay any tip for some 'bag handler' to push your trolley a few metres to the pre paid taxi booth (outside the terminal) i.e. 20/30 R/-, or another tip (£1 perhaps, or a great deal more) to the man/boy who loads your bag into his taxi which is also unnecessary even if he has his hand out and cajoles/harrasses you. Even if you are disabled or have special needs there is no justification for this behaviour. The cops take a cut of all your generosity anyway.
If you have paid the government rate for your fare, the taxi driver is getting a commission for your fare already. It is not even necessary to tip him on arrival at your destination and 20/30 rupees would be generous e.g. if he carries your bag up a few flights of stairs, and doesn't have his hand out like one of the multitude of beggars you will later encounter.
Split. OP wants to avoid paying what he/she thinks is a mandatory £1 tip to get bags from baggage reclaim to the taxi booth. £1 = 77 rupees approx. Daily manual unskiled wage equals 150 to 200 rupees. Do the maths. Said unofficial/illegal luggage handler is neither a government employee or member of a registered baggage handling company; he's a chancer paying bribes to the cops to allow him into the so very secure anti terrorist airport seclusion zone.
Giving said c*n artist £1 (or much much more) is half a days wages of unskilled labour in a few seconds to this low life. Comparison of the value of money is irrelevant, like 'it's only a quid'. Indians think likewise and give these trumped up deceivers very vocal short shrift.
This started with the intention of giving helpful advice, but seems to have deviated because a nit picking individual can't grasp the simple fact that a tip is not mandatory or necessary, should not be extorted from you under harrassment, and any tip is already factored in to the government taxi fares.
If you want to arrive flashing your cash, so be it. Consider for a moment the inflationary impact your largesse has on the local economy and the ability of locals to afford the ever increasing prices for basic essentials. Crash Test Dummies (soon to be tested i.e. fleeced) with more money than sense impact severely on the local ' non tourist' liveliehoods, foster resentment and abuse towards 'gora' foreigners, and only make you a 'mark' for further cheating.
It's because of people like this that there are so many problems, not least for the Goans, many of whom still dry their fish for storage during season so they can eat through the monsoon.