Willingham is a traditional English Green Gage, and considered by enthusiasts as the finest of all plums that can be grown in the UK.
It has the classic sweet melon-like flavour which marks out the green gages as distinct from regular plums (although nowadays plums and gages are categorised as the same species - Prunus domestica).
It is almost certainly a seedling of Old Green Gage, and therefore a sibling of Cambridge Gage - in fact they are hard to tell apart, but all possess first-rate flavours.
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Willingham is partially self-fertile, like Cambridge Gage and Old Green Gage, and in a good spring can set a full crop. However as with all gages a pollination partner (of a different variety) is useful to improve cropping.