Fisher presented the BBC Radio series Birds In Britain from its inception in March 1951 until its end, twelve years later.

[citation needed] Fisher was one of the members of the small party that on 18 September 1955 raised the Union Flag and took official possession for the UK of the tiny, uninhabited, rocky islet of Rockall, in the North Atlantic.

[2] He was the resident ornithologist in the regular "Nature Parliament" series broadcast in the 1950s on BBC radio as part of Children's Hour.

It is likely that his writing and broadcasting played a significant role in the growth of interest in birdwatching in the United Kingdom in the post-Second World War period.

A public appeal allowed the seabird island of Copinsay, Orkney, to be purchased as a permanent nature reserve dedicated to his name.