In the 1970s, my late Brother, Andy & I used to collect toy soldiers.
There was a particular brand, that was very detailed, & used a bright green metal base. They were made/marketed in/from the United Kingdom.
We had a set of Queen’s Guards, and US Civil War soldiers, as well as Roman Legionnaires.
Andy is dead, and I cannot recall the brand.
Do any UK or Toy Collector Dopers know the name of the brand?
Britains?
Airfix maybe, Bosda?
Doesn’t sound right.
After Google Imaging–no.
Airfix has a dull green base, rounded.
These were more rectangular, & vivid green.
Britains Deetail?
Bingo.
Spot-on perfect.
And the Romans were a different brand, too.
Many thanks.
No probs! 
I just did a google search for “british brand toy soldiers 70s” and the wikipedia article for Britains Deetail came up. Then I did an image search on the brand to see if it matched your description.