Assuming that you’re going round the blue route in the right direction (ie clockwise), it looks like the ‘red route’ in Fineshade takes you down the Jurassic Trail which is mainly a dual track / bridleway that leads you all the way down to the A43 (you can then cross the A43 into Duddington & Tixover and pick up another bridleway that brings you back to the road between Barrowden & Wakerley).
Anyway – It looks like you make a right turn somewhere that I haven’t spotted / tried yet that then loops back across the Jurassic Trail / bridleway – I don’t know what that is like either
…but I’d guess they’re very muddy at the moment and will remain so until spring….