I remember Seagull ! I used to buy the Micromodels from there. The models you mentioned were packaged in the same way as micromodels but a lot bigger. You may be interested in the following
Heritage Models •
I'm not sure when Roger started designing kits. They are completely different from "yours". They are hand designed and a lot bigger - and in colour.
What happened to Seagull? I know they closed but a new shop opened just up the road from "you" on Exhibition road.
At one of the shows a visitor said she had seen us the previous year and thought I'd like some kits she had found in her late father's house - It was three of "your" Heritage kits.
Cheers
Mike