FDP's
Guys you are treading on dodgy ground here. It depends on what your FDP really is. Is it a fully taxable amount that is part of your salary or is it what used to be called "allowances" to cover food and expenses whilst on duty?
If it is the former and you are being paid your expenses another way then it is part of your salary and eligible to be counted towards mortgage calculations. If it is the latter then most airlines have managed to get the majority of this amount tax free. The argument for having this tax free is that under almost all circumstances the crew person will be spending all this amount on expensive hotel food.
If you now are saying that you do not need all this money to survive away from home and a lot of it is being used to pay for expenses at home (like a mortgage) then the tax man will come along and (quite rightly) say that this payment is not wholy being used for the purpose for which it was intended and take away the tax free (or partial tax free) status of these payments. Your colleagues will really love you for upsetting the apple cart. Best keep quiet because I can assure you that this government is looking at every way to claw money out of the tax system and you are opening up a glaring hole. I suggest you start spending all your FDP's for the purpose they were intended!