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With the resurgence in interest in plums, growers have increasingly tried to improve on the popular English Victoria plum, and Excalibur is one of the best examples. The plums are larger than Victoria, and arguably have a better flavour for eating fresh.
Excalibur is not self-fertile - it needs a pollination partner, but Victoria is compatible. Cropping is lighter than Victoria (which is no bad thing) but still productive, and Excalibur has better disease resistance.
Advice on fruit tree pollination.
Excalibur was developed at Long Ashton Research Station near Bristol and released in 1989. The mother variety is Count Althann's gage, noted for its superb flavour - and there is an obvious resemblance.
The same breeding programme also led to another popular garden plum variety called Avalon.