G109
Basic LH pay point 1 is £54069 pa. You then add FPA at about £650 a month and duty pay at £3:19 per hour from check in at LHR to check out. That's maybe around £1200-1500 a month. That's all subject to UK tax. Your duty pay is taxed at 20%. I am SH so have no accurate info on the achieved allowances so it's an estimate.
What are your chances of going directly onto the RHS of the 380 fleet? As your rated and they have said internally that they will recruit at least 20 onto it in 2016 I would have said pretty good. Why would they go through the the hassle or type rating you on another type when you have a rating we need.
Hope that helps with your decision.