The British air power in Greece early April 1941

The British air strength in Greece in early April 1941 consisted of the following squadrons:

No. 11 Blenheim bombers
No. 84 Blenheim bombers
No. 113 Blenheim bombers
No. 211 Blenheim bombers
No. 30 Blenheim fighters

No. 33 Hurricanes

These were a mix of Hurricanes and Gladiators
No. 80 single seat fighters
No. 112 single seat fighters

No. 208 Army Cooperation (Lysanders?)

Wellington bombers from Egypt were 
available on moonlit nights

In fact, when the attack happened on 6 April, there were
only 80 operational British aircraft in Greece. The main
problem was the shortage of suitable airfields and space
for planes.