Thanks everyone for your replies. Doesn't look too good for us then as it all depends on whether the authorities in that country could be bothered. I think if he's going to go anywhere it would be to South Africa which is on that list.
The UK has no authority to make foreign courts enforce maintenance orders.
Exactly. That is why we have reciprocal enforcement arrangements : to ask their courts to enforce our orders, and vice versa.
It would be a bit of a rum do if the District Court of Mumbai suddenly started helping itself to money in a bank account in NatWest Stevenage to satisfy a maintenance order it had made. So it asks the Hertford County Court to help.