Hi Sue,
All sections and graves are maintained and preserved, but Health and Safety Regulations were the kiss of death for many headstones
http://www.communigate.co.uk/ne/darlingtonhistoricalsociety/page9.phtmlThis link should take you to a site dedicated to the West Cemetery. Near the bottom of the page are links to a site plan, and one to an ongoing project of headstone transcriptions. Their numbering system is completely different to actual plot numbers.
As a rule of thumb, if you enter the main gates and walk along the central path, graves to your left are numbered 99 down to 1 and then 300 upover, while those on your right are numbered 100 up into the 200s.
To locate John's plot, it is in section H which is the second section on the left. Several headstones are marked with an actual plot number, usually at the back near ground level, so check for one with WW, XX or YY (or 2W, 2X etc.) to give you an idea of which is row YY. Then follow that row into the section, checking other headstones to confirm the right row and then check for grave numbers
to find one with number 57. All graves with that number are in a line so you should now be able to determine where John's grave is. Of course, the presence of a headstone is also a good clue
Colin