I've just noticed that Avios E-Store are offering 8 Avios per £1 for a Hilton purchase until 10/10/16 (tonight!). An excellent bonus on top of the current sale. Unfortunately I've only noticed 3 hours before the end. I think this may have gone unnoticed by quite a few people. For comparison, the Virgin store is offering 6 miles per £1 and Gate 365 doesn't have Hilton.