UPVC FENCING AT DRAYTON MANOR PARK. A fit and forget solution to crowd control at Drayton Manor Park. Weather resistant and low maintenance this Fensys UPVC picket fence is non-flammable, will not rot, does not require preservative treatment and will never need painting. Park operators at Drayton Manor theme park and Zoo commissioned this Fensys picket fencing after years of repairing and painting miles of traditional wooden fencing.