Balls - if he is earning 100,000 quid a year he is a catch and any smart woman would recognise that and wind her neck in if he is happy where he is. What would she do if they all trooped off to the sand pit and he failed his check or just did not get on (does happen, no matter how good you think you are). Dump him for the tennis coach? Hope she's a looker, 'cos she will need to be if she goes down that track.
Kids brought up in those joints can become brats, or worse brats than they already are, so creating a better life for them is a bull**** reason to go expatriate. There's more to life than perpetual sunshine. On his current salary I am sure they can all have a nice family vacation every year in the Caribbean if it's sunshine and dark skin that make her horny.