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Bay tree - leaf damage - please help identify

I have 2 bay trees grown in pots outside my front door - they have been grown in the same pots/compost for 3 years now and have been very happy until now. Today I have noticed that some of the leaves are damaged. I have attached some pictures:
I have cut off any of the leaves like this and hope for the best, but does anyone know what this is and how to treat it?

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If ithey've not been re potted for three years can I suggest that you re-pot them next spring. A bigger pot and fresh compost (I use John Innes No 3 loam based for mine, with some added horticultural grit). They get very pot-bound and then the leaves begin to look a bit poor and susceptible to attack from all sorts!
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.
Same happens on random leaves with mine. As pf says it's caused by a little caterpillar type thing inside. There's often a bit of web to pull the leaf closed around it. When the caterpillar clears-off that bit of the leaf dies back. Nothing to worry about, and i've never had more than just a few leaves affected.
Billericay - Essex
Knowledge is knowing that a tomato is a fruit.
Wisdom is not putting it in a fruit salad.