I only just discovered your site and in particular the route planner which is excellent; easily the best I've seen in general.
One problem I found is that it thinks there is a ferry across Loch Etive, joining two parts of the B845 together. There is no ferry and it hasn't been there for several decades. A number of maps don't know it closed down either, but it did. The problem shows up if you ask for a route from Taynuilt to Barcaldine.
I'll let you know if I find any other glitches but that's a very good service.