You can seek a Court order for the money, or seek to make him give you the land.
You need to write a letter, set out your losses and request a refund within 30 days or say you will go to Court. This is called a pre-action protocol letter of claim. You should make sure you send this signed delivery and keep a copy. You must give 30 days warning before going to Court.
If they do not refund you then you can issue proceedings in the County Court. You can either do this online at: www.moneyclaim.gov.uk or by completing form N1 https://www.gov.uk/government/publications/form-n1-claim-form-cpr-part-7 and take it to your local County Court.
The Court will then issue a claim which a copy will be sent to the Defendant who will have a limited time to defend it, if not you can enter Judgment and enforce.
If the claim is for £10,000 or less it will be a small claim so you will not need legal representation. Over this value, you would need representation for trial.
If you want the Land it wont be a small claim. You would need to complete forms N1:
The Court would list for hearing and decide whether to order the land is transferred to you.
If the Court does and he refuses this could be contempt of Court which he may be warned, fined or sent to prison.
Can I clarify anything for you about this today, please?
If you need anything further I am available for a follow up at no extra cost.