Not to be that guy who asks for help and disappears without giving an update, I thought I'd say that I've completed the job. I used a colossal wago box to fit all the wires in and it's safely tucked away. I did consider coming at the wires form the top, but realised the hole in the bathroom is directly underneath the loft steel beam
And excuse the mismatch of wago connectors, I had to make do with the few older ones I had left over.
I also managed to move the pullswitch cord along about meter or so too. Tested all the wires and connections before putting them into the wago box and closing it up.
Thanks all!
