Copper Underwing Palps

One of the ways we found to diagnose Copper Underwing vs Svensson's Copper Underwing.
On the later the palps should be quite grey with yellow tips only, were as the Copper Underwing has more yellow palps all the way along.
As you can see here, a freshly emerged Copper Underwing can also have yellow tips, since we had the caterpillar and were able to make a positive ID of Copper Underwing.