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The moth is a Large Thorn (Ennomos autumnaris), which I have not seen ins Scotland. The larvae feed on hawthorn. The fly is a fruit fly (Drosophila melanogaster), though why it's there is anyone's guess!
I hope Lachie is sensible enough to keep a safe distance to those spines.
Tony,nice shots. The first hoverfly looks like Eristalis tenax (Mistbiene), the second Helophilus pendulus (Gemeine Sumpfschwebfliege).Sorry don't know English common names.