If your coming from a Bentley, steer away from anything that is Vikan, from what I remember you needed something light, especially since your using a superlight as well (?) a Vikan rectangular flocked is a good brush, but generally Vikans are like a pig on a stick, way, way to heavy. Definitely don't get a Monofilament Vikan either, since they are rubbish and bounce around on the glass. Get a Dual Trim Super Lite from Gardiners, you'll definitely like that one, pricey, but good. Trust me on this one.
Don't limit yourself to one shop, ordering off the net is easy.