As I recall, the accident to XV345 was due to a fatigue failure in one wing stub spar due to surface cracking and it was not related to any fin failure. I had finished the OCU a few days before and then did not fly the Bucc again until September 1980. We were all very shocked, especially following the loss of an aircraft in Germany the previous year when the wing fold latch pin failed in fatigue. Luckily the crew ejected from that one.
The problem with the screen wash was that, with the AAR probe fitted, it flowed from bottom right of the windscreen towards the left side and so did not clear away all of the salt etc, hence the rudder cycling. The windscreen wipers had a limit of 350 KIAS/0.6M (again, from memory) so could not be used at normal tactical low level speeds. A couple of times I did have the screen wash stick on and it took about 10 minutes for the fluid to run out so that you could see where you were going!