[mdjlucan]

anyone know what this is on my Pear tree leaves

[Baldy]

I'm kind of guessing because that doesn't look like something has 'nibbled' - I reckon its frost damage.
(I have one pear tree that is one year old so you may wish to hear from someone with more experience)

Pip pip,
Balders

[Baldy]

Could be worse:
http://www.agf.gov.bc.ca/cropprot/tfipm/fireblyt.htm   

Pip pip,
Balders

[LotuSeed]

If it is fire blight, you may find this video helpful. nwPG7zqA5N0