Trade names in common use.

[Sits]

Airfix. Maybe it was just a UK thing but regardless whether they were Revell, Monogram or whatever the generic term term was Airfix kits.

[ursus arctos]

Just a UK thing.

My sense is that you used Hornby for model trains in a similar way.

[ad hoc]

I'm not sure if we did. Hornby were ubiquitous and it seemed like all model trains were Hornby, but in my memory we just called them model or electric trains