The British aviation situation greatly improved by the summer of 1941

The British air strength in the Middle East had grown to 300 aircraft by May 1941. They expected to reach 520 in the middle of July. The situation in Takoradi had greatly improved. They were able to erect 161 aircraft in May, a huge improvement over the 100-or-so that they had been able to erect. The goal was that there needed to be 300 aircraft a month added, to just replace losses and worn-out or obsolescent aircraft. The actual figures in mid-1941 were:

Month    Aircraft arrivals

May      206
June     352
July     265

In addition, in July, 16 aircraft arrived from South Africa and 76 from the United States.
This is based on the account in Vol.II of the Official History.