If the house is being repossessed and he's just abandoned it then it's actually heart breaking for the children. When they went out to Dubai I think they genuinely believed they were looking for a holiday home in Dubai and could split their time between Dubai and UK whenever they felt like it. Even now Chris has been pushing the idea that it is their permanent home, I don't think they realise what little choice they have in it or realise that they are never going to get another house as big as they have in the UK.
If it's true, they had no idea that they were leaving all their things behind forever. Sarah is also still planning on being back for cosy Autumn/Winter days before Christmas. I don't know if there is any truth in it but I could see it happening.
It's something that will become known in time, so it's not something he can run away from and still be pretending to earn £10k a day. He lives his life online in public view so people will know. They are expected back in August for Taylor Swift and it will be immediately picked up on if they either don't come back at all, or do a quick visit only staying in London.