Another IFR approach that had debatable clearance was the Trails GCA. In both the Phantom F4 and Tornado F3 it was common place for a formation to use their AI radar to follow the leader whilst he performed a GCA. We flew up to 4 aircraft at 1nm spacing down the approach with cloudbase as low as 200ft.
With a good GCA controller, as soon as the 1st aircaft called visual, the talkdown switched to the next in the stream and so on. It was a very efficient way to recover 4 aircraft quickly, although could be fraught with difficulty.
If ILS were available it was much easier as a Trails ILS put all of the control in the cockpit. For Combat Ready crews the workload was quite manageable.