Hurry and get an extra discount on your fuel at Sainsbury's

"Spend £50 and get a discount of 5p a litre off your fuel at Sainsbury's petrol stations"

If this offer is still available then you could use your BaBeeCard to buy the Sainsbury's vouchers at a 5% discount, so you would actually be spending £47.50 and recieving the petrol vouchers.

http://www.dailymail.co.uk/news/article-1037170/Petrol-prices-slashed-5p-supermarket-forecourt-battle.html