Hi There,
Ther simple answer is yes.
Now for the complications to that simple answer. There are several very good reference books out there that can tell you a great deal about Britains production. If you can find a copy of Obriens book, Toy Soldiers Identification Guide from 1997, Joe Wallis Regiments of All Nations or Opies, The Great Book of Britians You also need Joplins book Britains New Toy Soldiers, 1973 to present (2008) You should be able to find all the information you need on any set made by Britains up to that point. The kicker is that these publications are hard to come by at times especially the Great Book of Britains. The Joplin book is still in print and I have seen many of them on ebay.
If you have a specific question or a need a set Identified post a photo of the figures and box etc. There are a lot of folks here who excell at IDing old Britains and other brands.
Dave