Sectional Appendix is available via Network Rail website. (Sorry can't find link at the moment.)I assume the OP wanted something useful for drivers, with relevant route details such as PSRs, signals & indications, names of running lines, gradients, level crossings, viaducts and tunnels, crossovers and loops, etc etc.
Yes the full sectional appendix can be found on NwR's site pretty easily, which is very useful but it's no good for signals.

There's a set of maps I've got covering Wellingborough to St Pancras which are works of art