I can confirm there is not. The UK AIP also shows it as VFR only. It's strictly PPR and the voice providing permission on the phone strongly stressed that point when I flew in there, as well as confirming the need to talk to Benson inbound.
If an emergency is declared would Benson accept an approach and landing from a GA aircraft, or would they provide a PAR/SAR or some kind of guidance into Chalgrove, again if an emergency was declared?