After the British fighter bombers and day bombers achieved some successes against Axis airfields in Western Cyrenaica, the Germans resolved to do something to put a stop to it. They decided to go after British airfields with the aim, as the Official History quotes, "to regain air supremacy".
The British aircraft also staged a low level of attacks on the Axis supply line. Why this was only a low level, we have a hard time understanding, but that is what it was. During this period, about one hundred sorties against ground targets were carried out by Beaufighters, Hurricane and Kittyhawk fighter-bombers. Particularly successful were the Hurricanes that operated at night against encampments, transport, and aircraft.
Another change was that tactical reconnaissance units were replacing Hurricane Is with Tomahawks. In the period leading up to May, tactical reconnaissance in the forward areas was critical, so the effort to improve the survivability of reconnaissance aircraft was very important. This is based on the account in Vol.III of the Official History.