In the Uk in the event of a dispute on registered land it is possible to register a caution on the title, preventing the owner from selling

Is there a similar procedure here in thailand

In brief we repaid borrowings of father in law, he was due to transfer land to us in return, we paid for the chanut to be divided and redrawn, he then changed his mind and took the new chant from the land office

After much discussion he agreed to repay us and not sell the land without our consent, which I have in writing, in both thai and english, also witnessed along with acknowledgement of the debt, however I do not trust him anymore

When I put the money up I was aware of the risks but do not wish to let him off the hook too easily

I need to ensure he does not sell the land and pocket the proceeds, if reasonably possible

Just get the Chanut, keep it, you should have the name changed to your wife's, check out the back of the chanut, any loans on the land will be written on it.

You can either:

1) Pay to change the deed to your wife's name, or

2) Register a loan from your wife on the deed

Both require his consent. In general contracts are worth very little. They are only enforceable in Court, which takes years and is expensive. If by the time you get to Court the land is sold you are fighting a losing battle.