The oldest flying British a/c is the Blackburn Monoplane of the Shuttleworth Collection (
http://www.shuttleworth.org)
Both the Fleet Air Arm Historic Flight's Swordfish are Blackburn built machines - and thus known as 'Blackfish'.
BAe Brough (IIRC) was a Blackburn factory, restored / rebuilt the second machine, W5856, 'City of Leeds'
There's a good little Sutton book 'Blackburn Aircraft IIRC, worth getting as a primer.
Hth.
Cheers
James K