Digital map query

The Southern Electric Group has been approached as follows:

Our contact corresponded with David Lawrence, the designer of the Southern Railway diagram introduced in the late 1950s, about this and his other designs, right up until his (I assume) death. Once he mentioned that his design had been digitally reconstructed and published in a Southern Electric magazine.

Unfortunately, I was not able to track down the magazine (not Live Rail) or the designer, and now all correspondence seems to have been lost. So, if this is ringing any bells, a digital restoration of the attached map, do let me know.

Can anyone provide any answers to the query please? Please contact the Live Rail editor Simon Jeffs

Southern Railway diagram