The five GBG2018 pubs are, Bridge Street Ale House, Freebird, Hop Inn, Hopwater Cellar, Lymestone vaults. I used to drive through the place and wasn't impressed but I've never drunk there so couldn't possibly comment. Inconveniently it doesn't have a railway station so it's a bus from Stoke.
Stamford is good, four GBG2018 pubs plus a couple of other decent ones, it's compact and has rail connections (via Peterborough I believe so ECML).
I think it would be pushing things to call Lincoln the Midlands but it's great for pubs apart from that bloody hill. Rail links are still a little bit convoluted, especially from Leeds, it's usually a change at Peterborough from London. While we're in the Lincoln/ECML area, Newark isn't bad for a day out either just a bit of a walk from the ECML station (North Gate).
I'd go to Kidderminster any time but Stourbridge was mostly shut when I went there and there's the rattler from Stourbridge Junction to "enjoy", but I could be persuaded.
How do we set up a poll?
Contenders so far (with GBG pubs)
Bridgnorth (6)
Kidderminster (7)
Lichfield (4)
Lincoln (9)
Loughborough (6)
Newark (5)
Newcastle UL (5)
Norwich (26)
Stamford (4)
Stourbridge (5)