WW1 Cap badge for identification

[Imsomewhatokay]

Hello!

I have a WW1 cap badge that needs identifying! The images aren’t too clear, I have a feeling it’s royal horse artillery but I’m not sure! It’s my great grandfather (George) and sadly he’s not around to ask!
If anyone can identify it I’d be very grateful! Pictured also is my great grandmother (May) who seems to have something pinned to her chest that I can’t identify, it may be a nurses watch? Long shot but if anyone can figure that out too I’d be really happy

Thanks,

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