I have done some research on your behalf but found nothing else near the city centre. If you find one, do let us know!
P.S. again, if you do find one, don't forget to apply for a CAA permission to be exempt from the 1,000ft rule (ANO rule 5) for operations in/over a congested area. Might be easier/more cost effective to land outside the congested area, or at a licensed airport (obviously there's only LBA or Helijet) and get ground transport to the actual destination.