The University of Reading is running a FruitWatch project. Here is how they describe it:
Fruit trees are highly dependent on insect pollination to produce fruit, and climate change is impacting both the timing of fruit tree flowering and pollinator flight, which could reduce pollination and fruit production. We need your help to understand how fruit trees are changing flowering dates across the UK, and with your help we are gathering data on four common fruits, Apple, Pear, Plum (including Damson and Greengage), and Cherry.
In the Park orchard all of these will be appearing soon, and there are lots more around. So take a walk in the park, snap some of these and submit them to the project. Its all in a very good cause!