Today, tens of Harlequin egg clusters were very obvious under the leaves...
...often close to aphid infestations.
One of the clusters was already hatching: a new generation of Harlequins
There were also many 2 spot ladybirds on the cherry, I am not sure they are as advanced on their life cycle as the Harlequin, although this pair was mating. Given the strong impact of Harlequins on 2 spot populations, it is obvious there is more than one war going on in the cherry tree. All the photos, except for the top one (26/05/12) taken today.