(12 Jan 2014, 2:45 pm)Dan wrote Probably a lot simpler to just have 4926 replace 8236, 4927 replace 8237, and so on.
Suppose so!
Well, bar the Deptford ones, these are the SPD's that need replacing:
8220 - Winlaton
8221 - Stanley
8229 - Gateshead
8236 - Chester-le-Street
8237 - Chester-le-Street
8238 - Chester-le-Street (Can't 4944 just be it's replacement?)
8239 - Percy Main
8241 - Percy Main