engine - 4:07 pm on Sep 30, 2013 (gmt 0)
Correct, there are no redirects at all.
So if I understood well, currently there are no redirects implemented from the old to the new site?
How big is the old site, that is, how many URLs are we talking about?
Old site is small-ish: about 150-pages
The site has analytics, and probably 50% of the site generates referrals to varying degrees.
Does the site have analytics to see which old URLs drive traffic? How many of these are (or is it the whole of the old site) ?
The redirects to be implemented - would this be for traffic only or to pass link juice too?
Ideally, both. The traffic would be to avoid losing the opportunities from now until the site is closed. The link juice to the old site would benefit the new as they begin to build the new site's inbound's. Customers will eventually use the new site, and no further redevelopment of the old site would be undertaken.
When the old site is shut down eventually, would the business still own the old domain, i.e. could the redirects from the old site still remain in place?
They will still own the domain, but they may not wish to retain the existing hosting after a sensible period of time. I estimated a year would not be unreasonable.