Well, sort of.
We took the tube from Kings Cross to Earl's Court to Richmond, so we didn't have to ride thru central London. We had to wait for a number of trains until there was room for us and the bikes. But finally just after 11am we we actually riding. The first part was thru Richmond and then Richmond park and it was generally OK.
Then we hit the Thames. The bike path there is really the Thames tow path hiking trail. It was rough, often with tree roots and big holes. And full of people walking their dogs who mostly made room for cyclists. A couple of times it was just a dirt rut thru a field.
Needless to say we didn't make very good time. There was also a small diversion to find a bike shop as I had a gear cable that looked, as they say here, "dodgy/" The first bike shop provide by Google wasn't a bike shop but I guy with a van who would come to you, but he was on vacation. The next one was too busy to work on my bike but did sell me a cable.
Anyway it was getting on to 5pm and we still had 20 miles to go on these terrible trails, so we bailed and took a train. That is itself was an adventure., but more on that later.