Hi, does anyone know what this fruit is please, growing wild on the roadside, the red fruit is off different trees to the the yellow fruit which are growing alongside each other but while the fruit is different the trees look the same, the red fruit are about cherry-tomato size and the yellow ones slightly smaller, the red ones really juicy and sweet the yellow ones less juicy, they have a smallish stone in the centre and resemble a small round plum, the trees are literally dripping with hundreds of them, and they are delicious to eat, anyone know what they are. Thanks.