@Rosanna ****
then do the leg work in the UK, get the TR60 and keep it in your pocket, so to speak. It will save you time applying for one in a neighbouring country to Thailand, which can take a few days before you return to Thailand. Also note that you are allowed only two visa exempt land crossings into Thailand per calendar year, tourist visas crossing land borders don't get counted in that, neither does flying in. Extend each entry by 30 days. Find a more suitable long term visa that you can meet the requirements for, if needed.