Raspberry leaf damage for ID, please

Raspberry leaf damage for ID, please

Observation - Raspberry leaf damage for ID, please. Description: Leaf damage, mainly alongside the veins, on the leaf of a wild Raspberry (Rubus ideaus). Can anyone tell me what is causing this, please? Edit: Originally put in ? as I wasn't sure if it was fungal or insect damage. I'm now guessing insect and moving i

Leaf damage, mainly alongside the veins, on the leaf of a wild Raspberry (Rubus ideaus). Can anyone tell me what is causing this, please?
Edit: Originally put in "?" as I wasn't sure if it was fungal or insect damage. I'm now guessing insect and moving it to invertebrates at least partly in the hope that someone with more expertise will see it and comment.