It wasn't quite GBP1000 for working a day off, in fact crewing (their name for that department, ) couldn't offer anything for a day off and weren't allowed to call you on day off. ( I know as my girlfriend(now wife) was in that department)
The 1000 pounds came up when they misallocated the leave bids and ran out of crew at the end of the leave year and offered to buy back leave at that rate.
P*ss poor planning, p*ss poor performance! Reminds me of EK as well!
PS I believe Virgin pay 500 pounds for a day off callout, with 2 days off in lieu as well