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Location - Cumbria, UK.
There are 5 species in the UK in the Loxocera genus.

I tried using a key, based on the following features from my images.
* size 7-9 mm
* scutellum orange
* humeri black
* face above eye dark brown to black, face below eye yellow-white, with a stripe of white hairs from the mouth across the cheek.

Using the key with the above produced a result which didn't fit, especially since there is a broad mid-brown band down the middle of the face below the antennae.

However, apart from the colour of the humeri, these features seem to fit Loxocera sylvatica.

Looking carefully again at the humerus (or where I think it should be in the image!) on the female (left side), it does appear to be dark orange on the underside, not black.

In the image with the male only, I am not sure how far the humerus extends, but it does appear that the extreme outer corners of the thoracic dorsum are orange to white, even though there is black further inwards. I am not sure if this counts as the humerus.
Is this sufficient justification to say that it is actually L. sylvatica?

1st image of male (on left) approaching the female for mating.