Opinions on Soho Thai restaurants?

In article , Ian
writes
>I'm looking for opinions and prices (typical all-in price for
>3-courses plus houes wine) on three Thai restaurants in Soho:
>Bahn Thai (Frith St)
>Sri Siam (Old Compton St)
>Chiang Mai (Frith St)
>
>We're looking for a not-excessively-expensive venue for a birthday
>celebration (10-15 people), and are interested in opinions on the
>food, service and prices of any of the above restaurants.
>
>Does anyone have any experiece of any of them ?
>
I've been to Sri Siam quite a few times, and found it to be good. Service was pretty good too.