Yes you have it Pete, we used to take the children here in the 90s when it was the 'White Cliffs Experience' a very good day out.
The figures in the photo were part of a larger exhibit exploring the Roman landings at Richborough and also the port of Dover under Roman rule and the 'Classis Britania' fleet. I was at a loose end one day and decided to visit to see what remained displayed in the Dover Town museum, worth a visit when all opens up again.
Over to you