1. Dear Stuart, you have a good claim in restitution for payment of all monies you expended upon the planning application, including all consultants and other items you expended money upon. You can draft these proceedings yourself. However, I would suggest you employ a solicitor as this is an action for which you will need to be able to cite legal authorities in your favour. Get the solicitor to issue legal proceedings seeking payment over of the monies you have expended in reliance upon the representation that you were going to jointly develop the property. This claim will include all professional services you expended money upon. Be aware that you will be able to include payment for your time spent on the planning application.
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3. You are welcome.