Thanks.
Hey, Squatch. Trackwork isn't nerdy!
I only changed a couple of values in the track rule so I could do the Long Preston - Hellifield stretch, so nothing major and nowhere near as bodgy as what I did to the Woodhead trackrule for Wycombe Branch.

The track is default S&C too.
As Stuart says, once the track is laid and saved then it will stay there whatever you do to the track rule subsequently even if some of the track properties need sorting out when the default track rule is reinstsated.
Last night I did a full cache verify and everything is still fine. Apart from the water supply in Appleby that I forgot to replace...
Simon - I think you'll have a while to put some pennies aside while Stuart does his thing. But I'm sure you could quite happily pretend that you're buying this version in it's own right, in a slightly roundabout way.
More, ahem, 'testing' of the route required, methinks.
Cheers
Bob