Well, in short, the state of UK mainline station architecture is not particularly inspiring outside certain "compulsory" Victorian termini (and a few intermediaries).
These are indeed great displays of steel and wrought iron in both structural and architectural terms. However, even these suffer from the incomprehensible use of wooden slats under eaves that "decorate" the platform awnings at most of the stations in the country. Even though Victorian architecture did follow historical themes, adding these picket fences to the new, (relatively) clear-cut industrial style wasn't adding anything notable, being merely a throwback. Luckily, there are also stations from that era with more simplified awning decoration of steel beams etc.
[Rant off.]
As exteriors, such post-war modernist/internationalist designs as Dundee with its uncompromising series of vertical divisions throughout, or Plymouth with the glass clerestory "lantern" above perhaps somewhat crudely detailled first floor canopy are rather passable designs. They both reflect the lightness in colour as well as with Plymouth also the light within the station itself.
London's derided Euston and Coventry both are (again, despite their dated detailling and material choices), nevertheless, imposing horizontal and rectilinear remakes of old stations. Coventry has even rather bold cruciform concrete(?) and glass extrusions in true internationalist sense, whereas Euston's best part is actually off the station altogether, in the much more individual office wing facing Euston Rd. Don't know whether that actually sums up those times, but there seems to have been more thought put into the dark anodized "ribbing" extruding from the glass curtain

than to the more plain, plated facade of the station.
There would be more, new and old, interests in London's DLR and Underground, but mercifully I'll keep this to the mainlines...
