Leaving at 5am you can blast down the a40. (Sunday's are much quiter than Saturdays but 5 is early enough for sat ).
Most of it is cycleway and you only need to go on the road for a short section but that is a fast downhill.
We do it going out for TTs lots.
Alternative is via harefield but it takes an extra 15 mins.
Oh I forgot about that path. I've actually seen you on it before. I always get lost on it of course when you need to cross over closer to Ealing. Take a wrong exit in some underpass and end up riding to Ruislip or some shit again.
Leaving at 5am you can blast down the a40. (Sunday's are much quiter than Saturdays but 5 is early enough for sat ).
Most of it is cycleway and you only need to go on the road for a short section but that is a fast downhill.
We do it going out for TTs lots.
Alternative is via harefield but it takes an extra 15 mins.