
Elwell Road is an unseen Road in Walford, the postcode for this Lane is E20 7YU.
In an episode dated 29 June 2015, Carol Jackson is seen sticking her hospital letter to the fridge and it shows the below address.
Walford General Hospital
Oncology Department
Elwell Road
Walford
London
E20 7YU
In an episode dated 3 August 2015, Shabnam Masood is seen reading Kush Kazemi hospital letter and informing him he's not got Cystic fibrosis.