I'll be very interested in your assessment Phil. I may need to buy a tin when I'm next in Wentworthville.
For those who think "Madras Curry Powder" is not used in India, and / or those who may wish to make your own Madras Curry Powder, here is a link to a video in Hindi (with English Sub-titles) by The Bombay Chef - Varun.
https://www.youtube.com/watch?v=24CfBr5t1FsAt 4.40 - 4.50 he refers to the "Market shelf very identifiable or popular Green Box, but now you can make it on your own at home". There are others in the Green Box but I suspect he is referring to Ship. When making this I suggest omitting the Fried Onion and Garlic for better storage shelf life but Varun says it can be frozen for up to 6-7 months with these included.
Some other Green Box Madras Curry Powder brands from India: Kwality, Mother's Recipe, Eastern, Kitchen Xpress.