Caterpillar id help plse, no pic

[minime]

the caterpillar had a black, diamond shaped pattern running down its back, with pale yellow sides, some hairs, but not in tufts. on the ground, in birch woodland, beside a loch, NE Scotland. Can't see it in Collins Field Guide. I'm not expecting a positive id, but any help much appreciated. Ta

[basquesteve]

This is a good site Wyszukiwarka g?sienic

[minime]

Hiya

OK I'll give it a try