 Additional filming took place at the "Holby City" set in Elstree, as well as the Queen Elizabeth Hospital for Children, a Barratts office block in Brentford and an ex-MOD tank testing site in Chobham.A theme tune was devised, consisting of both the "Casualty" and "Holby City" theme tunes played over one another in sync.Terry Ramsey of the "Evening Standard" described it as "shambolic", opining