@Roger *******
Go to your local Amphoe and check their requirements to obtain a Yellow House Book and a Pink Thai I.D. Card. Might require an appointment at your embassy to certify your passport and you can obtain a copy of your birth certificate online (if UK citizen?) Get everything that is in English or other language officially translated to Thai and visit the MFA to get it certified and clear up any requirements that they might have. Fulfil all the Amphoe requirements which likely will required photos of you at the house with the local headman and witnesses. Get signed photo copies of all the ID cards of the Thais involved and submit the documentation to the local Amphoe. There will likely be a meeting to attend at the local Amphoe with the Thai witnesses and possibly your local headman (men) in attendance too. (You can compensate them for their time financially). Get your thumb prints and photo taken at the Amphoe and you should be ready to receive the Yellow House Book and pink Thai ID cards. Obviously your wife’s assistance during this process will be invaluable.
Once you’ve achieved that, nothing will seem difficult again and life should be much simpler when dealing with bureaucracy, banks and phone companies etc.