He's at Millbrae Saddlery and the number is 01355 573000. He tends to be about in the mornings but out saddle fitting in the afternoons. Your best bet would be to take the horse to him, he's near Jackton, just outside East Kilbride. He has a small arena so he can see the horse ridden etc, he won't travel a distance unless there is a number of horses/saddles.
There was only me and Anne Scott covering Scotland as far as I was aware. I gave it up years ago but I'm pretty sure Anne still does it. You'll find her on Facebook or Google. I think she's in Aberdeen but she does cover central and travels down