It’s not 100% infallible but it should be pretty reliable. cycle.travel has a significant difference to many other route-planners in how it works out access rights in the UK, so it should avoid the private farm track issue that some suffer from. I’d suggest double-checking any sections marked as ‘service road’ – cycle.travel does try to avoid these but occasionally they slip through, and these can sometimes be private farm access roads.

That’s very helpful Richard. I will give it a go. Thank you.