Have recently started cycling to work again. Can’t really do it when I’m doing nursery drop off as it’s too much hassle.
Usually join the A24 at Colliers Wood and just head all the way to Elephant and Castle on that, over Blackfriars Bridge, then to Farringdon. Have experimented with a few variations, doesn’t seem to make a great deal of difference. The worst bit is heading home and all the traffic lights along Farringdon Road. Takes ages. Elephant and Castle is a lot better now than in the bad old days - so much better for cycling through.
Ride takes about 45-50 mins. Hard to get much speed up really.