Hey!
OK, so I spent the morning doing the 50/50 method, weirdly, I didn't find an issue with anything, so I put all my CC back in the mods folder and thought I'd give it a go.
Can you believe the game ran straight away?! I don't know what miracle or Sims fairy happened, but somehow it now works.
To say I'm confused is an understatement!! I did nothing different today than yesterday. I'm not complaining though!! Lol
I just wanted to say thank you for all your replies, help and time. I really, really appreciate it.