No, Ive never driven any of them but peakirk is very very mild, just a gravel track but pretty long.... so shouldn't have any issue, I baught 2 maps, OS land ranger 1:25,000 and a OS explorer map at 1:50,000 (just waiting to receive explorer) you clearly see all the lanes... what you then have to work out is which ones you can use and which you have to get landowners permission? not sure how you do that...knock their door?
I still have some issues with my SJ too... fuel air carb setup is way out, not sure how to do it, play in steering? and I may have an issue with head on its way out, I get mayo in the cap? hopeing its just condensation... so Im going to go for a good run this weekend to see what happens... will probably have a look at the byway at peakirk then...