Avenger
Shanwick, perhaps you would like to give us the benefit of your take on the position rather than refer us to an overseas work allowance that is not appropriate to a Uk based contract where all the duties start and finish from a UK base? agreed, the IR have a habit of making things complicated with phrases such as " non domicile" etc etc, but this LGW contract is a clear cut case, unless you can advise us otherwise?
There are many pilots working for UK based airlines with UK based contracts but resident in another country doing just that. As every case is individual I could not begin to advise on every possibility.
I suggest you contact a specialist such as
The Fry Group - Tax & Financial Planning for UK Residents & Expatriates. They have considerable experience in the field and could give you accurate and personalised advice.