Here's a few updates for the routes in my route guidebook for mountain biking in Scotland. There's only one small diversion that I know of; Route 16 in the Pentlands near Edinburgh (see below). The rest of the routes described in the book are all good as far as I'm aware.
I do, however, also have a few interesting alternatives/improvements to a couple of the routes that I've found since it was published:
Route 1 : The Three Brethren
Notes: You can extend this route by riding through Bowhill house and following the track to the top of the hill where you follow the Queens Drive back down to near Yarrowford. It a great track with awesome views along the way.
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