Ju 88. source In Britain, this task of flying enemy aircraft fell to No. 1426 (Enemy Aircraft) Flight RAF, nicknamed the ‘Rafwaffe’. It was s a Royal Air Force flight formed during WWII to evaluate captured enemy aircraft and demonstrate their characteristics to other Allied units. Several aircraft on charge with the RAE Farnborough section were also used by this unit. The RAE facilities at Farnborough were utilized for the flight testing of German and Italian aircraft during the war. Many crash-landed airframes were brought to Farnborough for examination, testing and cannibalisation of spare parts to keep other airframes in serviceable condition. The main flight testing work was carried out by the Aerodynamics Flight of the Experimental Flying Department and the Wireless & Electrical Flight, the latter responsible for evaluation and examination of radar-equipped aircraft later in the war. Read More: http://www.thevintagenews.com/2016/05/03/the-rafwaffe-was-a-british-raf-unit-setup-to-test-fly-captured-german-planes/
Apologies Sheldrake if you could not focus on the article. Is this better? Was meant to be a topic starter. https://en.wikipedia.org/wiki/No._1426_Flight_RAF
The Germans had a similar unit called the Rosarius Flying Circus. Its job was not only to evaluate E/A but to take them around to various LW airbases and familiarize the local pilots of the strengths and weaknesses of each.