Artik,
Here's some info on the Stuka during BoB:
At the start of the war in September 1939, the Luftwaffe had:
336 Stukas (serviceable 288).
For the Battle in the West, on May 11, 1940 there were:
414 Stukas (serviceable 345).
By August 1st. for the Battle of Britain the number available was:
327(serviceable 261).
The losses for July had been low with just 12 lost.
Between August 1 and August 18, 47 were lost due to enemy action and 4 more during operations.
The Stukas were withdrawn from the Battle of Britain on August 18, 1940.
Originally the LW tried to draw the RAF out over the Channel by using Stukas to target channel Shipping. Stukas also targeted radar installations etc, but after failing to draw out and destroy the RAF in the air the LW shifted tactics and set about to bomb and destroy RAF airfields in southern and south-east England.
Stuka losses were high but their withdrawal seemed to coincide with the LW change of tactics. Tactics for which the Stuka was completely unsuited for.