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A solitary bee, rather than solitary wasp, I believe and parasitic on certain ground- nesting bees.
There are many species in this difficult genus, and they all look +- the same. You can't get to species - it 'might be' almost any of them on the basis of the images.
I am aware of the difficulties,I did tube the bee in the photo and key as well as I could in the field.I know with Specodes thats still not much more than an educated guess.
In other words, you can't identify to species in the field. Even a specialist would want a specimen and a microscope, and might find it hard even then.
The key characters in all key couplets (and S. pellucidus keys out in couplet 9 of my key) are all microscopic, and impossible to appreciate in the field. Just occasionally one can do S. monilicornis based on head shape - beyond that, it is no more than guesswork
Lat/Lng: 52.1026, -4.6954
OS grid ref: SN154483