Junipers and Pears, really? You may not find that combination delicious, but pear rust (gymnosporangium fuscum) does. This is a fungal infection spending the winter with Junipers and the summer primarily with pears. The rust-like orange spots are easily detected on the pear leaves, and unfortunately you will find that some of the pear trees in the Hanwell Meadows are infected.
Short of fungicides, mechanical control is best: prune or remove infected Junipers and remove infected leaves from pear trees.