Now that people are being encouraged make use of all NHS services again, it's timely to mention the Adult Weight Management Service run by the Guy's and St. Thomas's NHS Foundation Trust. 

This has normally been a mix of face-to-face advice sessions and group-based physical activity sessions, over a 12-week programme, so expect some changes to arrangements.  Contact the Local Early Intervention Prevention Service (LEIPS) helpline on 020 3049 5242 for further details.  You will need to be referred by your GP to join the programme.