You need the bike with you, or some main-colour part of it, when you ask for "British Racing Green". BRG is whatever dark green is surplus or near the door to the paint store on the day you ask, and in better-controlled organizations it depends on whether the product must look like BRG on television, in which case it is an entirely different color so as not to look black. I have a bike that's often mistaken for "British racing green" that is actually "non-RAL Forest Green", a custom mix that took off to the extent of getting a description in Germany that first identifies it as not within the official RAL system, and then by what is still a pretty generic name. But I know for a fact that the colour was mixed (in The Netherlands) to match gold coach lining well, nothing to do with forests. So the colour has to be matched on the your bike, and preferably in daylight. The simplest way would be to ask SJS for a touch-up bottle, because they're the ones who originally ordered that shade/tone/hue of green to be sprayed on the bike.