@Tod ********
Thanks helpful, yeah the exempt then change to the non-o does give more time. I did get looked over a bit at suvarnabhumi last time when entering (on non-o), I had come back quick (straight after 12 day honeymoon), after having an exempt then 30 day extension before.
No entries for 6 months before that though as we had been in the UK.
I'll most likely go out with wife if I need to leave, and come back together, hopefully they wouldn't have an issue giving me another exempt on return? It's easier as I don't have to apply abroad.