It would be great if someone could help identify this fruit for me. Two pics attached. Thanks in advance!
Definitely a plum. If a Cherry Plum as in a pure Prunus cerasifera form it should be producing smooth twigs and leaves on the small side, thin and light green, with some hairs on the midrib beneath, and small, sweet fruits on smooth, slender stalks with rough-surfaced pits inside. If a Cherry Plum as in a hybrid between P. cerasifera and another plum another combination of characteristics may be present. If you are in London, Ontario rather than London, England it is possible P. cerasifera is not hardy there - I don't know - and it would then have to be another species of plum.
We've got five big trees full of these things. It would be a shame not to eat them or make jam out of them or something. I suppose they must be edible.
Try some. If you like them, which particular plum they are will become secondary. They are definitely plums and will be edible. Later, if interested you can compare them with known Cherry Plum specimens, photos and descriptions to decide what to call them. Flowering characteristics are also part of the profile used to come up with a name. Fruits of Cherry Plum sampled here often too weakly flavored or poorly textured to result in additional consumption. However, orchard cultivars of Cherry Plum (including hybrids) with better fruit do exist.