Certainly an odd one there, Peter. There isn't a white spot in the dark wing eye.
Can't think of anything else though, so probably just a slight variation.
Amongst a variety of insects today, was this Epistrophe grossulariae. Only the second one I have seen this year.
And if this shy fly is what I think it is; something really interesting.
Possibly Xanthandrus comtus which would be a new species for me.
It kept flitting around, coming closer and looking seductive but moving further away every time I tried for a photo.