Codling moths gather early - or do they?

Bright sunshine, glorious warmth. What else to do but relax in the recliner, gaze languidly up into the apple tree, and "What the...?!?"

I counted 15 of them: small, dark moths with extraordinarily long antennae. I'd have thought them cute, but for their intense concentration on a tree that contributes substantially to our food supply. Anything that focussed and that numerous just has to be bad, doesn't it?

But what were they?  Seriously hampered by the fact that they were too high to see properly, and wouldn't stay still long enough for me to snap a close-up, I first plumped for the codling moth as the main apple pest known to me, but they would be rather early. Here we were at the end of April and the RHS tells us that they emerge in late May-June (to lay eggs on or near developing fruits from June to mid-July).