Great grid - had no idea on the one at all.

Holbein, wives, head, six could also be Henry VIII

@Dahlia . . . and we fell for the very clever (sneaky) red herring 😀

I’ve still no idea what two of these groups are even after the “explanation”

Well I have just discovered that there is a musical called SIX. I had to Google to even understand what Six songs meant. And I'd forgotten Cams existed.

It's rare to solve the grid, but not get half the connections (I just went for the 4 that could be connected to Henry VIII like the others).

Perhaps a bit too niche knowledge for me.