I moved from Manchester to Warrington 23 years ago. I'm definitely on the Mcr side though, with Altrincham close by. I have friends from when I worked over on the Scouse side of Warrington, near Widnes, who definitely have Scouse tendencies.
I'm also very close to High Legh, which is Macclesfield / East Cheshire, and we've been lumped in with them in the latest boundary changes. This means I'll likely see Esther McVey on my ballot paper sometime this year. Her chances of re-election won't have suffered by the acquisition of Lymm.
You should give Warrington residents a little leeway for their identity issues.