Autosmart are the UKs biggest trade supplier of car valeting products, supplying nearly every car dealership in the country. They have their own product and development factory just outside Birmingham, they also provide training for anyone considering valeting as a profession.
Contact the head office and they should provide you with your local rep.
Topaz is billed as a polish, but I would call it a top coat " glaze", it has all the attributes of AGSRP, in that it does contain fillers for fine scratches etc.
It differs from AGSRP in that it will not stain black trim and is based on " nano bonding", ok its not in the league of Gtechniq etc, but if you want a product that gives a silky smooth finish to your paint with exceptional gloss, and allows you to do the car in 10 mins flat, this is the product for you.