Carl I think I already answered this in your first thread - here goes again - either join the TRF, who have a pub meeting on the second wednesday of each month, and a TRF ride the sunday of that week, or go to
http://www.essexbikers.co.uk (where we arrange regular rides), or if you want to go it alone, use OS explorer/landranger maps, look at
http://www.trailwise.org.uk/gmaps/gmap.htm, or even use the online OS map here:
http://www.bing.com/maps/?v=2&cp=51.882 ... %20CO6%203 , if you don't want to buy one.
There are loads around braintree so you don't need to look far. Just be careful though, as some may be heavily rutted - and with the bike you have they may be a struggle.
PS byways are marked on OS maps as follows: ++++++, either in pink or green depending on the scale.