It is possible but will extend your ride quite a bit. Have a look on this map. Just to the west of the A1(M) there is a tiny village called Norton Green. Follow the cycle paths under the motorway too here, after that get yourself to Langley on the B656. From there use your OS Map to navigate to Mardley Heath, which is quite easy to link up with a few lanes and bridleways.
I’m leaving the rest up to you as it’s my summer commute and enjoy having it to myself 😉
Like the rest of us Herts riders just get out there and explore, as there are many more trails than you first realise.
Enjoy 😀