looking for the easiest quietest option, now that we cant get on the trains back to Little Missenden area.
Canal to Brentford lock, turn right onto the London Road, either go through Syon park or turn left off of London Road onto Park Road towards Isleworth (this is the only really busy bit). Then follow the river to Richmond Lock and cross over onto the Thames path, turn right off the footbridge then at the third bridge (Richmond) come off of the path and make your way up Richmond Hill and into the park.
There is a slightly more pleasant although steeper road that joins the Thames path and Richmond Hill a short while after Richmond Bridge (Nightingale Lane) but it’s a bit confusing to describe how you get onto to it. Easy enough on the ground though.