I think my phone must’ve autocorrected sRGB to RGB :)
I did a bit of checking with the photo printing services I’ve used in the past, namely Photobox and Bob Books and both specify the sRGB target colour space, so I’m thinking that a wider-gamut screen would be wasted money, especially as an AdobeRGB screen generally costs double the price of an sRGB-only screen.
Thanks for the advice about the comfortable viewing distance, I’ll get a tape measure to work out the actual distance from my eyes to the screen