Marjorie Seedling is widely available in UK supermarkets and is the main late-season commercial European plum. It is excellent for culinary purposes, and very good for eating fresh when fully ripe.
It is attractive to commercial growers because it is vigorous, hardy, disease resistant, and a reliable and heavy cropper. These qualities mean it is also ideal for the garden or small orchard - and by growing your own you can also get a far better flavor than is possible for the commercial grower - the trick is to leave the plums on the tree longer. And if you like fresh plums, there are not many other ones around this late in the season.
The fruit is large, plum-shaped, and purple, becoming blue-black when fully ripe, with a heavy bloom - overall very attractive. The flesh is greenish-yellow, juicy, quite coarse, and noticeably veined. The stone is clinging.
For eating fresh make sure you leave the fruit on the tree as long as possible to get the best flavor - very pleasant straight from the tree on a cold autumn morning!