Great Britain Philatelic Society

Could anybody be kind enough to give me any information concerning this shade. I have never been happy with this classification as no example I have looks yellow or brown.They all appear to be red.I'm sure that members have this shade in their collections.Any information would be appreciated.

Good morning
I think this shade is a reasonable description of a shade that does occur on (normally worn) prints from several of thes plates of this issue.
Regards
Mike Williams

Many thanks Mike