Majority of patients come from:
- Harlow
- Southend
- Chemsford
- Wickford
- Bilarecay
- Basildon
- Ockenden
- Grays
- Stanford le Hope
- Brentwood
- Romford
- Harold
- Wood
- Harold Hill
- Wickford
- Upminster
- Hornchurch and Havering
- IIford
- Redbridge
- Leyton
- Leytonstone
- Woodford
- Loughton
- Buckhurst Hill
- Chingford
- Barking
- Dagenham
- Chadwell Heath
- Manor Park
- Upton Park
- Eastham
- Beckton
- Dalston
- Hackney
- Hackney Wick