I thought I had a few photos of the concourse during the 1983 works, but cannot find them. Here a few from the platform side. From memory what was the travel centre was off to the side of platform 1 which was demolished when they built the multi story car park. The ticket windows were opposite where they are now, roughly where the Boots/WH smiths sit, possibly under the hotel building. The work involved filling about 1 or 2 carriage lengths worth of track to make the concourse deeper. You can get a rough idea how much closer the trains came into the station than now.
Also no proper hoardings in those days! Photos circa Feb 83.