My colleague has read all contributions to the thread and we have made peace over the subject of rad alts and Class 1 ILS approaches. I have to make a small correction to my original post and point out that he did not say you must use the radar altimeter readings for a DH reference.
In view of the huge amount learnt from all your submissions a truce is called and the only whisky involved will be a shared glass of single malt - after work of course.
G.
IMHO this is when Prune works best - not a single swear word or raised voice, a little bit of sarcasm here and there but otherwise an excellent discussion with a little hint of humour and a great deal of enlightenment