You're welcome, there's a bit that say's show 'bike paths', doesn't seem to come up automatically when you select the Bike! Be weary mind as not all bike path's are on tarred roads, every possibility it could be farmers track so a quick streetview could be in order to check it's kosher!
@Bernhard - I though the bike path thing was on? It was on my end. Thanks for the tip though!
@bombadil - you're saying avoid Lomond and Trossachs all together or go straight north rather than the bike path up there?