The No Singles policy at EGLF is NOTAMed and is still valid.
Really easy to find that out while airborne.... Just need a satellite phone, linked to a PC running a web browser
There actually aren't that many bad weather options with an ILS around these parts. Southend or Bournemouth both offer 200ft or so DH. Biggin is much less likely to, being on top of a hill.
Manston perhaps? There seems to be a permanent notam that their radar is O/S.