When I remember PlaySchool I always think of a film of a milk bottling line in the 'Through the Round Window' section of the show. I must have been a geek at the age of 5.
I don't think this particular film was ever featured on the 11am BBC2 slot but it's what gets me excited these day:
Anyway, it turns out that I'm still a geek and am about to (part) own a filling line of my very own. Together with Westerham & Sambrook's Breweries we've established a new business (South East Bottling) and are busy preparing new premises to house all the necessary tanks & packaging machinery to run a busy filling operation. When finished it will look very similar to this: