I am planning to return to Bkk in June. I have a Thai wife in Nakhon Sawan. I am currently working in China. I am a UK citizen but have been working in China for more that a year and Thailand prior to that. My questions are:

1) Can I enter Thailand on a 30 visa-exempt and then get a 30-day extension?

2) If I enter Thailand on the 30 visa exemption will I be able to get a visa on the basis of marriage within Thailand?

3) Should I try to get an O-Visa based on marriage before entering? (however my wife has our marriage certificate in Thailand).

Many thanks for your help in advance.