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      The Popular Flying 
      Association in the United Kingdom is a well run and very helpful 
      organisation that controls the building of experimental aircraft. While 
      the association employs a number of full-time professional staff, many 
      functions are organised by enthusiastic volunteer members. Each year, the 
      PFA runs a major rally that is the third largest in the World for home 
      built aircraft. Presently, this is held at Kemble Airfield near 
      Cirencester, Glos.. There local branches of the association in most areas. 
      These go by the rather nerdy name of 'struts' !
      Their website, (link above) is well presented and 
      informative.
Before a new type of 
      aircraft can be built or operated under the PFA permit scheme, it must 
      have been thoroughly vetted by the PFA engineering staff. Just because the 
      aircraft is flown, in for instance, the USA, does not necessarily mean 
      that it is possible to fly it in the UK. New types are being constantly 
      added.  
      The choice of homebuilt aircraft permitted by the PFA are 
      more restricted than in the USA. There is a limit to engine size, speed 
      and stall speed. Four seat aircraft can however now be constructed under 
      strict control. UK homebuilt aircraft cannot fly under instrument 
      conditions, at night and they must avoid flying over urban areas. 
      Permission must also be obtained before flying your aircraft to other 
      countries, unless a prior agreement has been made between the two 
      countries, (such as is now the case between the UK and France). Despite 
      the restrictions, homebuilding in the UK is flourishing and offers a 
      relatively low cost way to own your own aircraft.