I was acting thick, because I had entered their website at a point that gave no links 'home' or elsewhere on the site. Once I found 'home', I found 'contact us'!
Wife and I have flown SGA at least 15 times. Needless to say we are very happy with the service. During high season you can fly to Bangkok in the morning, do a day's work (shopping, medical appointments), and be back in HH that evening not feeling tired. Not bad!