probably just ops/crew control testing the water. i heard a few months back that they were going to get rid of f/o's working day off payments, but everytime they called one up they were asked 'will i get the payment?'. response was sometimes 'not sure' and they said no. they know people need the flying at the moment, especially in stn due to the allocated unpaid leave.
if people take them up on the offer then expect it to happen on a regular basis. there'll be a list in crew control's little office of those idiots who will work days off and deny themselves and everyone else the £230.
for those who were asking, we should get £230 per day off worked, capt's and fo's the same.
easy way to stop it happening, i think the kids on grange hill said it best:
'Just Say No'.