I have to go back into my flavor memory, but I don't remember it being smoky or with bergamot/citrus flavors. The Kusmi tea blends didn't sound close in description to me.
I now found an empty box that I guess I kept in the back of the tea cupboard for reference when I realized the brand disappeared. it states "Jackson's of Piccadilly Russian Tea, a Delicate Tea. Russian tea is delicate and light in colour. It is best drunk in the afternoon and evening with a slice of lemon and a little sugar." in English, French and German.
No ingredients or tea varieties are listed unfortunately.
All the Russian Caravan and Russian style teas I have researched seem to sound the opposite of delicate.
I've ordered a sample of Harney's Russian Country to test.
I discovered this tea back when the Phoenician Resort started it's High Tea and they exclusively had Jackson's teas at the time. That was quite some time ago.
edit: There is a line on one side of the box that states "A Blend of Russian Teas". Well, that's vague.