Posted: 29/10/2016 at 10:06
Sorry, but it is indeed Pear Rust. Those growths below the orange spots are the spore producing pustules.
This fungal disease needs two hosts - pears and junipers. See the link above for more information. There are no chemicals available for treatment and the best approach is a combination of removing nearby junipers and picking off affected leaves on the pear as soon as you see an orange spot appear.
This topic comes up regularly and you can use the forum search to find previous advice.
It has been a particularly bad year for this problem and all of my pear trees have been affected.