Rover90
It's only an interesting turn for BA because uniform standards have never really been an issue in the past. They are, in my opinion, looking for every possible reason to suspend you should you work on the legacy fleet.
It may not be necessary for you to have a watertight agreement but for some of us on EF and WW fleets we need such an agreement to protect us from Mixed Fleet. Perhaps you don't understand it but Mixed Fleet does mean an end to existing fleets and sooner or later we will be out of employment. I am sincerely sorry if you have a problem with that some of us are sincerely concerned about our livehoods.
Tiramisu
There's a strong rumour that they will be transferring all 767 from EF to WW for a couple of years. Where would that leave you? It certainly doesn't indicate that they are wanting to make you more productive. Don't be mislead by this company.