Hi Stewie
Happy to show you around East Sussex in a few weeks time - midweek or weekends. We can get you an escort party and take a couple of extras I'm sure.
As you probably know, there aren't a huge amount of lanes from Crowborough unless you add in the lower East Sussex Lanes. You might (will) need someone better than me to show the Pevensey Marsh lanes though as I hate them so don't bother venturing onto them. The whole lot is doable in a day but we all have a slightly different way of setting up our routes - also depends if they are one way or return later (one way will be a much shorter day).
Just as a warning, there will be heavy use the first weekend of August as it's Eastbourne LDT so around 100 bikes out plus Sussex TRF are having an event built around it I think.
It may not be ideal to bracket the weekends either side either if there will be a load of you. Keeps the locals happy (less unhappy).
If you PM me your email address I can email you OS map extracts with the lanes marked up as a guide - it is not definitive and also depends on any current TRO's (fortunately minimal, even in winter).
ESCC link to their Byway map and TRO list:
https://www.eastsussex.gov.uk/leisurean ... -closures/ Beware that some Byways shown don't actually exist or have been permanently TROd.
You will need the Kent TRF guys for their patch but I don't think there is much Crowborough way to link into Kent without a lot of road work. We have always headed up to Wrotham ar somesuch.
Another option would be to only do Crowborough area and then head Brenzett, Ham Street and Ashford direction for some on Romney Marsh and around.
Again, check against Canada Heights programme for their LDT date(s). They do one or two per year in Kent.
A Kent guy probably best on that unless some Sussex chaps have routes set up.
Cheers
David