Question: What was the name of the test service unit of aircraft after the BF110?
About the article "Battle of Britain", section "Fighters".

Candidate passages:
The Evolution of the Fighter in World War II : The World War Two period saw the development of the fighter aircraft from the biplane through to the introduction of the first jet fighter aircraft.
Aircraft featured in this volume include the Mustang, Spitfire, Hurricane, BF109, BF110, P40, P38 and Zero. 
The Allied Bombing Campaign of Germany : After Britain's somewhat faltered start to the bombing campaign of Germany in 1940 and the entry of the United States into the war the allies quickly developed precision area bombing into a highly effective assault with incredibly devastating results.
Aircraft Featured: B17, Wellington, Hampden, Whitley, Stirling, Halifax, Lancaster, BF109, FW190 and BF110. 
Allied Might versus German Technology : The combined day and night bombing of German cities was chiefly responsible for turning the tide of the air war against Germany.
Germany's response was a case of too little too late with the development of a highly sophisticated night fighter force and the introduction of Jet and Rocket powered fighters.
Aircraft Featured: P38 Lightning, Mosquito, HE219 Owl, Lancaster, P51 Mustang, BF110, Typhoon, ME262, Arado 234 and ME163. 
  24 September 1940 – 42 fatalities.
26 September 1940 – 55 fatalities, 49 seriously injured, 43 other casualties.
This raid comprised the Heinkel He 111 bombers of Kampfgeschwader 55 escorted by the twin-engined Messerschmitt Bf110 heavy fighters of Zerstörergeschwader 26, 160 aircraft in total dropping 145 high explosive bombs.
Details of the bombing raids.
Reports of casualties in the direct hit on the air raid shelter (24 September) are contradictory.
One report has approx 100 fatalities and approx 50 wounded, coincidentally the total of the two raids as listed above: it may have been politically expedient to combine those figures.
Another source simply reports many fatalities.
The most reliable report, because it is based on local sources in Southampton rather than RAF sources, is that the shelter was largely unoccupied because the air raid warning was late. 
Air Test and Evaluation Squadron Twenty can trace its roots all the way to the founding of the Naval Air Station Patuxent River, Maryland.
Recognizing the need for consolidation of the Navy's flight test efforts, NAS Patuxent River was established on April 1, 1943, due to its proximity to the coast, freedom from air traffic congestion, and isolation for testing of classified projects.
On June 16, 1945, the Navy officially designated the Naval Air Test Center.
In April, 1975, after 30 years of operations at Patuxent River, the Flight Test Division, Weapons Test Division, Service Test Division, and U.S.
Naval Test Pilot School reorganized under the Naval Air Test Center into the Antisubmarine Aircraft Test Directorate, Strike Aircraft Test Directorate, Rotary Aircraft Test Directorate, and Naval Test Pilot School.
Under the command of Officer-in-Charge Captain John A. Dunaway, Antisubmarine Aircraft Test Directorate was tasked to support the fleet through the flight test and evaluation of aircraft systems for the VP, VS, VAW, VRC, VQ (TACAMO), VQ (ELINT/SIGINT), VR, and VT squadrons.
In order to more closely identify itself with the communities to which it was responsible, the directorate was renamed Force Warfare Aircraft Test Directorate in June 1986.
In May 1995, the organization officially became a squadron and was renamed Naval Force Aircraft Test Squadron under the command of Captain Stuart A. Ashton.
In order to more closely align itself with the squadrons it serves, in May 2002, under the command of Captain Steven R. Eastburg, the squadron was redesignated Air Test and Evaluation Squadron Twenty.
Now a combined USN / USMC organization, the squadron has also assumed responsibility for test and evaluation of Marine Corps VMGR aircraft and follow-on Navy VP and VR aircraft.
The squadron is currently under the command of Commander Jason L. Rider.