I'm going to do everything as you guys have suggested at some point today.
https://imgur.com/a/iqHNqBt
Prior to trying the suggestions I had a little play around with the folders and got the Bitcoin Core to start opening the [default wallet] which it's been doing now for the last 15 minutes...not sure if it's stuck or not but going to let it do it's thing for a couple of hours then work back on the suggestions.
Thanks
UPDATE : Bitcoin Core is now 'Rescanning' when I've attempted to open the old wallet.dat file