@Murray ****
you do not get 30 days free on arrival plus the sixty days you apply for as tourist visa
To get your 30 days exemption you need to leave thailand an come back to get the 30 days don’t make the mistake many do and think you get a total of 90 days when applying for 60 day visa
You will be charged £25 per day for overstay and they don’t take no money as an answer when you try to leave Thailand