For the past couple of years we've settled on Peacock brand Thai Fragrant Rice.
Comes in a bright yellow bag 10kg
Cost is around £10 and we generally buy it from Costco
We've tried quite a few different brands over the years.
We used to always buy Green Dragon Thai Fragrant Rice from Wing Yip (London) but we just don't get down to London much these days.
It's about the same price as Peacock for the 10kg bag.
If you google the brands Andy you should be able to find your nearest stockist.