I found some M pattern egg cups a couple of months ago. They were the first examples of this pattern I'd seen after a few years of collecting. Then this month tow more examples appear on eBay. The first this vase, shape 341, and in the same week a jam pot (see next post). Either I'm very lucky or else the pattern is less rare than I thought.
The observant collector may also have noticed a) the yellow circle missing from pattern at the centre of the photo, and b) how there are similarities with the more common FK of "oak leaf" pattern shown here .