Thanks for your comprehensive comments James, which did remind me of the kind of mass we’re talking about here, something that HAS to be considered where stairs are concerned. It is only a single flight, and they’re not communal. I would do the same as you do and carry the mount and OTA down separately, it would be the only way.
Thanks also for your comments re the ED Starwave, and the non ED. I shall also check out the link you’ve kindly included.
I believe I’ve read the comment from the Denmark ED owner, but really wouldn’t want to go for it on the strength of that alone. I will in keep a check on the 2nd hand market in the meantime.