He conceived "Hello World" as an "obvious title"[3] and intended it for Cliff Richard, who recorded Britain's entry "Congratulations" for the 1968 contest.

[8] It was released as a single in March 1969 with the B-side "Up, Down, All Around", written by band members Len "Chip" Hawkes and Alan Blakley.

[16] Philip Crawley of the Newcastle Journal suggested they had reverted "to the lowest common denominator of pop"[17] while Tony Barrow, writing under his pseudonym Disker in the Liverpool Echo, said the band were "back in the usual happy-go-lucky rut".

[19] Geoffrey Elliot of the Coventry Evening Telegraph criticised the song as having "none of the verve of their earlier hits" and considered its changes in tempo "more annoying than arresting".

[21] Peter Jones for Record Mirror praised the song, writing that "they are back to the optimistic, fast-paced sort of determination that registered before ["I Shall Be Released"] – and "Hello World" is the right mixture of breeziness and brashness that should restore them high in the charts".