X layout Highbury & Islington
Y Layout Crystal Palace (but one side has bays facing away from the junction)
Back To Back - Huddersfield
The following dont quite fit into any category, but are unusual
Warrington Bank Quay would be an X but one of the lines has no platforms (closed 1962)
Wilmslow platforms are all parallel, but are after the junction. I would call that a closed Y
Dore a Half Y but platform is parallel to main line a closed half Y
Cathcart something like a half Y but with an island platform, platforms are on
the main line and never had any on the branch.
Gospel Oak, - a Half Y but with the addition of a bay platform on the main line.
Nuneaton has parallel platforms, but they are really on two separate sets of lines
(though there is a junction between the two). Sort of like Wigan NW and Wallgate combined into one station !
Upminster the NR platforms are in two parts, with LU platforms inbetween, and no
connections between any of them
Greenford the NR platform is a bay in the middle of an otherwise LU station.
Stratford not sure how you would describe this ! Used to be an X plus a Y, but
now the NR portion is more like a K (platforms branching off in two directions)
Wembley Stadium a normal two platform satation, but with a turnback loop in the centre road between the platforms