Greetings again Oliver,
If I might interject just seeing folk ride a route and finding it on a map are not the final parts of the equation.
With respect you do not know if those that you saw using the route were riding legally nor can a map provide you with the up to date information regarding legalities, however your local TRF Group will know and can provide you with the correct and appropriate advice.
I know of routes shown on maps and Highway Authorities' online websites that look as though you could ride them but the data is out of date for a variety of genuine reasons. I have, in good faith, been caught out that way myself in the past
and no doubt I would not be the only one
Until the Authorities improve signage on routes, or accept our offers to assist, this will always be a potential problem. It might say 'India' on the tyres of a bus but that doesn't mean they were made there nor that the bus is going there
TTFN
Hugh.