To be fair, on £60k net, you won't be able to afford BA economy once you've got 2 kids. Look at school holiday flight prices.

I would quit your job and start putting videos of yourself playing Minecraft onto YouTube since (and my kids are keen viewers of this stuff) it seems an easy way to make £1m per year if you're half decent looking at the views they get. Stop motion DIY Thomas the Tank Engine videos would also bring in around 5x more than you make now.

The more I delve into You Tube (forced by my kids) the more I realise that you really are wasting your time going to medical school etc when you can make a fortune churning out schlocky vids!