Re changing the title tags, no you don't need to add any redirection.  Yo only need to do this if you also change the url and the existing url has already been indexed.

I've done quite a bit of redirection on some sites when optimising and so far suffered no issues, but I'm going to go away and view that video!

Hi.  Everything Tom said and I also wanted to add another extension to this - If you use Firefox this is for checking nofollow and dofollow links.  When you add the extension, if you right click and select the nodofollow it hghlights nofollows in red and dofollows in blue.  I use it all the time.

https://addons.mozilla.org/en-us/firefox/addon/nodofollow/

Thanks Tom.

For one site in particular I have some very good reasons to link back and forth with another related and trusted site - I just wanted to be sure that I wasn't endangering myself by linking back.

Does it 'water down' the link juice if the link is reciprocal?

Are they worth anything, if they are from relevant sites?  I'm I better off avoiding linking back wherever possible?

Thank you, very much appreciate you responses.

I need to migrate a wordpress site from domainname.com to domainname.co.uk.

If I just put a 301 on every page on the .com will that cover it?

Would it make sense to go and change all the backlinks/profile links to the new .co.uk site or doesn't it matter if you have a 301 redirect on it?

Thanks