Can I Obtain a Medical Certificate for an A-O Visa in Thailand?

So i started the process for an A-O visa. Police cert arrives just 4 days after application. NHS doctors say they do not have the capacity to do medical certificate, too busy. They offered a copy of my electronic medical records in order that i can go to a private clinic. Private clinic say i must have x-ray and blood tests, no idea yet how much this will cost. Could i have had this certificate issued in Thailand on my last visit ? If so any reccomendations for a clinic or hospital near Jomtien that would issue it that is acceptable to the Thai Embassy in UK. Thanks in anticipation.