Similar to Royal Brierley but not sure this one actually is RB. Don't think I have seen a frilly rim like that on a bit of RB Studio and the pattern is not quite right, this is splodgy - RBS is usually a bit more Jackson Pollock... not sure that makes any sense! There may have been a bit with a similar finish on the board recently, I think it turned out to be Heron. Sorry have to dash out so can't search for it now.
John