If you haven't already done so, why not look for Rubyroo2 and Rubyroo1? The OS map shows a direct line (restricted byway, not only a path, so in principle, one can cycle this route too, but at the moment I don't think this is possible) between all three caches - well done if you can find it.
Congratulations to kryfto - FTF this cache
Congratulations to look-sharp - FTF all three in this series on one day