@Barry *********
I had a 2 day over stay the year before and all was ok, the non O visa is £60, you have to convert your documents to a pdf file and attach it to the application, they also want evidence that you have 18k or more in a UK bank account. I got my non O visa back within a week of applying, you have 3 months then to enter Thailand, the 90 days start from when you land.