Strange that this should come up - I was on the verge of asking the same question about the Engineering Access Statements online myself. The detailed plans were available on Network Rail's labyrinthine website, but every so often they seem to get moved and my bookmark to the relevant page suddenly takes me nowhere!
I've tried using the search facility on the website, but drawn a complete blank. Tried all the usual - National Rules of the Route, Engineering Access Statement, Register of Possessions, etc. All I've been able to find is a series of maps with the outline plans for 2014!
With the Easter weekend upon us, and the line past the house closed for engineering, it would be nice to know what NR are doing - and more importantly where exactly! I know there's nothing I can do if a ballast train parks up under my bedroom window at 2am on Saturday morning, but if it's gonna happen it would be nice to know in advance! (Gives me enough time to get drunk enough to sleep through it

)