Rather disparagingly referred to as 'plywood wonders' the British Railways (Western Region) boxes built in the 1950/60s era were a cost-effective way of replacing a life-expired or damaged box. Further examples could be found at other locations, for example....
https://www.ontheupfast.com/p/21936chg/25386595404/x50031-up-working-hungerford-station. They were pretty much universal in their design that could be positioned either way round and with doors pre-installed at either meaning that the steps could be positioned easily as appropriate to the site. Rossett signal box replaced an earlier GW box that was located on the other side of the track and the level crossing on which I am standing to take this photograph. Rossett station closed in October 1964 and by the time of our visit here in 1981, all that remained were the platforms that still saw very occasional use by specials conveying pupils to and from the nearby Moreton Hall Girls' school. By 1986 the line through the station was singled but this was again doubled during 2016 between here and Saltney Junction (Chester).