Caerwent: Often used on stage and regularity events. A nightmare of little roads and easy to get lost. Until 1993 it was the Royal Navy Propellant Factory. I was pleasantly surprised that it was sufficiently geocoded to run a TT rally stage there. You won't have to stop at the PCs, just "virtually" note the code board letters. Plot this route at the highest zoom level (ZStreet2) on the grey roads. All junctions are represented including NTRs. Geocoded points are sparse on these roads so you may have to click more than usual to find them.
SS1 @ 348934,190339
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to SF1 then EOS @ 347227,190869