Question: What is the publisher group that is based in Stamford, Lincolnshire, England, that publishes a bi-monthly, aviation magazine?

Context paragraphs:
Key Publishing: Key Publishing is a magazine publishing company specialising in aviation titles, based in Stamford, Lincolnshire, England.

AirForces Monthly: Air Forces Monthly is a military aviation magazine published by Key Publishing, and based in Stamford, Lincolnshire, United Kingdom.  It was established in 1988.

Airliner World: Airliner World is an aviation magazine published by Key Publishing in Stamford, Lincolnshire, United Kingdom and distributed by Seymour Distribution LTD in London.  In the United States, the magazine is distributed from Key Publishing LTD's office in Avenel, New Jersey.

Air Pictorial: Air Pictorial was a British aviation magazine covering defence aerospace and civil aviation topics.  By 2002, when the magazine was assimilated into "Aviation News", "Air Pictorial" comprised 64 volumes containing 620 issues between them.

Sport Aviation (magazine): Sport Aviation is an aviation magazine published since 1953 starting as "The Experimenter".  The content focuses on experimental homebuilding of aircraft and general aviation topics, including antique, war, and classic aircraft.

World Aviation: World Aviation magazine was a long-running publication for the aviation industry.  It was aimed at companies and aviation professionals and was freely distributed to more than 170.000 manually selected addresses worldwide.  Its front page famously had a quote by US astronaut David Scott to Dr. Ahura F. K. Yazdi (founder of "World Aviation"): ""I've been fortunate enough to have a view of the world that few men have seen... to realize just how small it can really be.  WORLD AVIATION will make the world a smaller, closer place for you to do business.  We've needed this publication for a long time"".

Aero Revue: Aéro Revue (ISSN 0001-9186  ) is a French and German aviation magazine published in Brugg, Switzerland.  Founded in 1906, it is one of the oldest aviation magazines in the world.  In addition, it is one of the largest aviation publications in the country.

Pilot (UK magazine): Pilot Magazine (UK) is a monthly general aviation magazine based in the UK.  It is 'Britain's best selling GA magazine'.

Flying (magazine): Flying, sometimes styled as FLYING, is an aviation magazine published since 1927 and originally called "Popular Aviation" prior to 1942.  It is read by pilots, aircraft owners, and aviation-oriented executives in business and general aviation markets worldwide.

Air Enthusiast: Air Enthusiast was a British, bi-monthly, aviation magazine, published by the Key Publishing group.  Initially begun in 1974 as "Air Enthusiast Quarterly", the magazine was conceived as a historical adjunct to "Air International" magazine.  "Air International" was (and still is) involved with current aviation topics and the "Quarterly" concerned itself with historical matters.

Supporting paragraphs: Air Enthusiast Key Publishing
Answer: Key Publishing