Just stopped here for the first time overnight. Well worth the tenner 
You get a £2 voucher for use in shop, restaurant or bar, and a shower voucher. Food is good, beer is good, the shop has all sorts of goodies for stocking up your fridge (I recommend the duck and Armagnac pie at £1.75) and the shower is hot and clean! I stopped with one of our Euro drivers, and even he was impressed 
If you are lucky enough to have a boss that pays parking, there’s a £14 ticket with a £6 voucher. Highly recommended…