Buddleja leaf spots

Hi all,
Have noticed a bit of brown leaf spotting to our buddleja and was wondering what is causing it and whether it needs treating in any way. Pictures attached. I should add I don't see anything critter like that could be causing it so far anyway.
Thanks for your help
Have noticed a bit of brown leaf spotting to our buddleja and was wondering what is causing it and whether it needs treating in any way. Pictures attached. I should add I don't see anything critter like that could be causing it so far anyway.
Thanks for your help


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