You are a Non-Brit...your contract (Letter of Appointment) is with BIAGLE (a Jersey, Channel Islands shell corporation)...seconded to Bristow Helicopters Ltd (Nigeria)...live outside the UK...work in Nigeria...contract terms clearly state the work schedule can be changed at will by the company...also...in the fine print...a two year contract period only counts the time "in Nigeria" towards completion of the contract...thus it takes three years to complete a two year contract.
Just how much chance do you have at winning some sort of legal action?
Get real!
If you don't like the setup....pack yer trash...and go find another job....saves you a lot of expense in the long run.
Now tell me we don't need an International Union of some kind?
One man's opinion.