OP, I am really sorry this has happened to you. Unlike other posters, I don’t think he’s got another woman. I actually think he’s on the run from either HMRC, investors, creditors or somesuch. It could be he’s escaping because all his businesses are about to implode. The timing suggests this ‘sudden’ split is pre-planned. Do not, as many other posters have suggested, ‘cut your losses’ and ‘move on with your life.’ It could be that there is fraudulent borrowing in your name. You need to do credit checks on yourself by obtaining statutory credit reports from the 3 main uk credit agencies. Search companies house to see if you are recorded on any of his businesses. You also should call the national domestic abuse hotline because I think you might be a victim of economic/financial abuse: 0808 2000 247. they can give advice, including whether you could/should report to the police online or through the 101 number.
don't take his claim that you're going to get nothing at face value. You need a specialist family solicitor urgently, ideally someone experienced in high-value financial remedy cases involving businesses and offshore assets.
If he had already decided to leave the marriage before the house was sold and the money moved abroad, your solicitor will want to know that. Moving an easily identifiable matrimonial asset offshore shortly before announcing a separation could be extremely significant.
The fact that properties, money and businesses are held through companies does not put them beyond the reach of divorce court. The court looks at everything. There is a formal financial disclosure process. A good solicitor can advise about obtaining company accounts, valuations and further disclosure where necessary. English family courts have powers to preserve assets, including freezing orders.
Don’y wait several weeks to see what he does. If he really is intending to leave the UK very shortly, the international element potentially makes everything more complicated. The solicitor needs to know about all this.
Make sure you have copies of the paperwork relating to the sale of the family home, the completion statement, mortgage redemption information, bank statements available, company information and any messages or emails concerning the house sale or his plans to leave. The chronology could be very important, particularly anything showing when he first decided that the marriage was over compared with when the house was put up for sale and when the proceeds were transferred.