Thank you so much for your kindness and for this very helpful advice. I'm going to send my father a link to this thread as he has flown before and will understand well the different planes you mention. I'm not sure which he has flown though probably one or the other at some point (and I think he would quite like another go too!)
Sounds like we are best to go with a half-hour slot to start with then.
Chevvron, thanks for the link!
SR