Hi all this is my first non 'o' based on marriage got the visa in uk says must be utilized before 1 sep 2009 so is that the last date i can do a border run or do i keep doing the 90 days i have now date i arrived in Thailand was 21st oct 2008 because heard they are good for 15 months any help regards Jim....

You can make an entry up to and including August 31st and get another 90 day entry. After that 90 days you will need to get another visa.

Yes. Do the final run before 1st September and get another 90 days.

Cheers guys for that Jim..