When accessed from http://www.virgin-atlantic.com/airport_parking.view.do or http://www.purpleparking.com/cool-ic...inInt-all.asp? , Purple Parking offer significantly lower rates than with the links from BA and BD pages to bcponline.co.uk for the same location.

I made a dummy booking for 4 days park-and-ride at LHR from 9.4 and got £25.46 compared with a regular rate of £37.95 or my discounted rate of £32.26.

No miles but a good %age saving.