Andrew, the light dome is quite distinct as a persistent orange glow from the south. It is annoying, but doesn't have a large impact that I can notice - the LMC was quite low by the end of the evening and yet was still quite clear to the naked eye, and the Milky Way still stood out richly. But I'd say Stockport is inching towards a Bortle 3 site status.
The above photo was taken of the southern sky (obviously), with the light dome intruding on the bottom right (it was taken when Crux was still rising).
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