What I mean by altitude was correct is that the QNH was set correctly and the altitude was 2300 feet as stated, neither an intimation that I was necessarily in the right nor a fixation with altitude. The Jetstream was outbound so had not yet turned onto the approach path printed on the chart.
It seems that the moral of this tale is that the IFR let down area is a dangerous place to be, and not obvious to those who may not be trained in IFR approach procedures and unaware of the extent of the approach patterns involved. I always contact ATC at the airfield concerned, there were a number of aircraft reported to ATC that day that were not in contact with them.