Instrument layout & SBA
Chugalug – I had no further experience of the Hastings post-1960, so think any mods to its instrument layout took place after that. Your pic shows the G4b compass beneath the horizon, which as you know was standard on the Mk2 while the Mk1 in my time had a DG on both panels – were the Mk1s updated later to the G4?
Flap15 – re your #7574, you will find a fairly full description on use of the SBA some way back in this thread, in the account of my WW2 training. This was posted in instalments at irregular intervals, and if you search for it I think the bit to look for was put up about a year ago; it covers the summer of 1944, when I was at 21 AFU Taten Hill and detached to 1534 (?) BAT Flight at Shawbury.