I think BA must change it's allowances system.
Allowances do not accurately reflect peoples expenses downroute, and I would prefer a larger and guaranteed basic, and more simpler allowances.
It is because of allowances that people bid for certain things, and it is because of bidding that we want seniority. Thus our lust for lucrative trips means we put on our own "concrete boots" and keep ourselves here.
Increase basic salary, introduce formula pay. Make allowances on a duty hour basis; the longer you work, the more meals you need thus the more money you get, like at LGW but worth more. Have an additional nightly allowance which is the ONLY variable factor between destinations to account for the economic differences.
This will mean that senior people have less need to bid for the big money trips, and will mean that junior guys don't spend all their time in africa and other low paid stops.
People will be less concerned about bids and seniority and will bid just for things that interest them. Operationally this lets all pilots have a fairer share of destinations and gain more experience sooner. Ultimately with a much higher basic, and less emphasis on allowances and seniority, other airlines in the UK then have a higher basic salary to use as a benchmark.
When BA pilots can leave the company and go onto a similar basic elsewhere without fretting over lost allowances, they will do so when something aggravates them. Likewise other pilots will come to BA satisfied that they can still have a decent lifestyle, less scuppered by the seniority system. For example they can stay short haul without losing too much, or go long haul and see more of the world than NewYork and Nairobi.
When more people are moving between airlines, they begin to wince from huge training costs, they need to improve pensions and pay to keep people in their company, just like happens in other professional jobs; in the real world.
We are highly skilled professionals, and most of us are fairly intelligent. We are however our own worst enemy when we trap ourselves inside a company which is full of jealous managers who simply want to shaft us.