The filled-in archway seen under the temporary HS2 bridge at Newton Purcell marked the entrance to the former Finmere station that closed on 04.03.63. In common with most of the Great Central's stations, they were built with island platforms permitting plenty of room on either side for track in line with them being constructed to the continental loading gauge; what forward-thinking that was back in Edwardian times! The small rectangles of what appears to be cement halfway up either side of the former entrance are in fact blocks of stone that a pair of substantial cast-iron gates were attached to closing off access to the station when it was closed to passengers. A very similar view to this one appears on the fantastic Disused Stations website, see.....
http://www.disused-stations.org.uk/f/finmere/index.shtml