34 WSU
I believe 34 Wing Support Unit operated on the same basis as the other (Group) Support Units in 2nd TAF, ie. it was there to maintain a pool of trained aircrew (and fully prepared aircraft) appropriate to its parent Wing, to replace losses as they occurred. As such it would not be responsible for training basic skills but for providing conversion training and continuation training for aircrew who were already experienced or had completed OTU training. If night reconnaissance training had not been undertaken elsewhere then it would have been provided by 34 WSU.