The dog-leg that connects Poynings to the Saddlescombe Road will be closed from Monday 15th February until Friday 19th February. More details here but the notice appears to be incorrect judging from the diversion signs already posted.
If you were thinking that you might escape from Fulking by driving in the opposite direction, that’s tough, the Edburton Road is also closed, for the same period (rat underpass work). Stock up and stay put.