I have a couple candidates. One is H&H Royal Ejector which I will leave without comment. The other one is more tricky, being a WW Greener from the 1880s. This one is Box Lock without Ejector, not a likely candidate for English Best. But a letter from the present Mr. Greener confirmed that it was in the works for three years and represents the Best of that time. So English Best could be more that one thing I would say.

With kind regards,
Jani