Yeah, there is a history of trying to cooperate on defence procurement projects but there isn't exactly a string of success stories. Some notable failures include a Frigate replacement in the late 80's and, after that failed, another attempt in the 90's which the UK again abandoned and pursued the Type 45 destroyer instead. Then there is the rather infamous Eurofighter, with the French eventually pulling out and pursuing their own Rafale. The A400M military transport aircraft is mired in technical difficulties, cost overruns and delays and may still be cancelled completely. The French were also involved in the development of the new British carriers with a view to ordering their own based off the same designs, however Sarkozy suspended cooperation in 2008 as they weren't happy with the way it was being designed (specifically they weren't happy it wasn't going to be nuclear-powered).
So yeah...not really any success on the large project front!
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