Examples were widely flown during 1911 and were used for instructional purposes at the ASL flying school, which was the first occupant of Hendon Aerodrome in London.

Both types were of broadly similar layout and construction to the Valkyrie A, differing principally in size and the engine that was used.

The Type B, which seated two people side by side in front of the leading edge, was powered by a 50 hp (37 kW) Gnome rotary engine and had a wingspan of 31 ft (9.4 m)[6] The Type C, which seated three people, was powered by a 60 hp Green water-cooled engine and had a wingspan of 39 ft (12 m).

[10] On 4 July 1911 a Valkyrie flown by Barber carried a box of light-bulbs from Shoreham to Hove, the first commercial air cargo flight in Britain.

Another notable early flight was made when Miss Eleanor Trehawke Davies chartered Barber to fly her from Hendon to Brighton and back.

[13] One of these crashed at Hendon on 17 September 1911 when on a trial flight after a new engine had been fitted: the pilot, Lieutenant Reginald Archibald Cammell was killed.