Hi Robert, many thanks for taking the time to write a reply (and to Ben to)
Re your points, I have only just started with BIG company.
Your 'before and after' is how I assume it was. They must have done then change about 7 months ago.
I tired Archive.org but nothing much indexed and has redirects on it. Both websites had a legal notice overlay appear that had to be accepted before seeing the content.
On small.com the sitemap.xml is listing all the big URLs, its using 0.9.
OSE has approx 40 inbound links from sites with 20-30 page authority and 30-40 domain authority.
I will try Xenu link sleuth as you mention (I'll dig out my old Windows PC first!)
I suspect as you mentioned in the caveat, might be better to just turn off small!
Many thanks again
Richard