Hello Andrew,
You posted this quite some time ago. Light nights & midges now arrived at my location so thought I’d take a look at IRAF. Thank-you for your instructions. It’s early days yet, but so far no major hiccups [see attached]. Are you still interested in any feedback? I’ll carry on and take it a bit further, up to prep. and use of instr, responses if I can.
Regards
john s