Pennine is further north (modern Derbyshire/Peak District [1]), so unlikely there. The Anglo-Brabant Landmass is the most likely location as it juts into the eastern Cotswold region (Oxfordshire).

[1] Source: me. Born and raised in the foothills of the Pennines in Derbyshire :)

>I mean, clearly it was above sea level, right?

Probably not by much. Think like Louisiana but with dinosaurs.