I've downgraded to PHP 5.6 which moves me on but I still have a connection issue which tells me:
Error encounted when connecting to your database.
Followed quickly with HTP: Error 404
I have checked my site definitions and when I click test both Remote info and Testing server (via FTP) tells me they connected successfully.
I have checked the connection file and I get the same Error HTP Error 404 as above when I click test.
I can't see the wood for the trees at the moment, maybe come at it on a new day.