Flying in Essex county in England, one day:

Southend ATC (having radio trouble): G-ABCD, Southend, radio check.

[no response]

Southend ATC: G-EFGH, Southend, radio check.

[again no response]

Southend ATC: G-IJKL, Southend, radio check

G-IJKL: Roger Southend, your readability, 4.

Southend ATC: Well... One outta three ain't bad.