ELC are currently giving a booklet with vouchers for manicure, spa day etc, if you spend more than £15 instore. I couldn't use my vouchers because all the venues involved were many miles away, so I decided to sell them on eBay, and they have just sold for £17.
Some sellers have also been selling the vouchers individually and they seem to go pretty well individually too.
Just thought I'd point this out in case any of you have some unused vouchers kicking around the house, or are planning a trip to ELC.