4Ad...
Very rough figures:
10 nights away per month
Only the odd day off "downroute" (standover) - in fact, these often are not a "legal" day off since they don't trigger 2 Local nights / 34 hours off etc. (get in late one night, out v early the morning after next).
Earlies generally considered unpopular, so since you well be getting what's left over, work on say 75%.
NoD (very junior on the Airbus at LHR)