Interesting story here:

http://www.raf.mod.uk/news/archive/70-years-on-raf-tornado-jets-recce-dday-beaches-03062014

The link to CRUSADER is of not obvious, but it is through the pilot of the Mustang of No. 2 Squadron R.A.F. which did the low-level recce at 1,000 feet, Air Commodore Geddes. As a Wing Commander in 1941, he was an observer in the RAF Command in North Africa, tasked with observing and analysing Army Air Co-operation. He wrote a pretty scathing report on the performance of the RAF in this regard.

http://www.rafweb.org/Biographies/Geddes.htm