J & G Meakin website dates the "Lilac Time" pattern as circa 1930s.
It is meant to have a handle in the centre, but this was missing when I bought the plate in an antique shop in the 1980s. I used to look for a handle, but haven't remembered to do so in years.
The scene looks a little theatrical, and I wonder if the design was suggested by a popular London musical, "Lilac Time". In 1923 the Melbourne Argus reported that "Lilac Time" had just celebrated its 300th performance in London.