Hi,
Thanks for your reply. I did replace all the links and paths (correctly I hope!).
I kind of gave up with this issue as I couldn’t find a solution until last week when I started having issues updating posts. I got onto live chat with my hosting provider and explained the problems and they said it was a lack of memory on my package because of plugins (mostly Jetpack).
They increased my memory (for free) and everything has been great now for a week.
Thanks for your help.
davbrn.