[Updated 24/4/2014 with The Snail's figures]
One of the more interesting facts to emerge from the ParkingEye case in Cambridge on 22/04/2014 was that ParkingEye pay £1,000 a week to British Airways Pension Fund to be allowed to issue charges at Riverside Retail Park, Chelmsford.
This works out as £52,000 a year, which if replicated over ParkingEye's 750+ car parks, would cost them £39,000,000 a year. It is known that ParkingEye do not pay to play at all of their car parks so the true figure is likely to be somewhat less; especially as the 2012/13 accounts show cost of sales to be £2.3 million. That would limit the number of pay-to-play car parks to 43 (all paid at the same rate).
To cover this, ParkingEye would need to issue and get paid for 20 tickets a week at the discounted rate of £50, or 12 at the full rate of £85.
This gives an interesting insight into the economic of the parking business. ParkingEye presumably have set their figures so they do not operate at a loss, and the number of tickets issued is therefore substantially larger than this [*1].
ParkingEye's figures in ParkingEye v Somerfield show they average 0.4 tickets per parking space per week on similar sites. The Prankster made an ad-hoc attempt at counting the number of parking spaces from Google maps, which came to around 580. The Snail did some better research and found the actual number of spaces was 510. This would put ParkingEye's take at somewhere between £10,000 to £17,000 week from this car park if it achieved similar ticket issuing rates to the Somerfield car parks.
The Parking Prankster
[*1] Another poster pointed out that ParkingEye could afford to run several sites at a loss in order to increase market share and drive out smaller competitors.