Maybe you got a great deal others didn't get. Not all jobs in the UK are that well paid.So the Nigerian money might be much more to them, percentage-wise.
Not everybody has a family and can remain outside the UK touring the world on a motorbike...
Talk to your tax consultant.
What are the UK out-of-country-requirements for the UK in order to get a tax cut ?
Is there a double taxation treaty between NG-UK ?
Meet your family in the Caribbean for the 4 week summer vacation, might help shave time off your UK time.
My take : I'll swap with you. Money isn't everything. You can still do this when you're kids are through puberty and don't need you any more.