After another 3hrs of my wife drilling and me shoving fibre optic leads and gluing, we’re done! Looks pretty sweet now 
We invited the neighbours round. The guy next door did wonder why I kept saying “I’m shoving it down now” and she was saying “to the window two inches” and “do you want me to pull on it” etc. Soundproofing isn’t quite as good through the tiles it seems!
I finally finished the day with the installation of a shiny new alarm and popping out for dinner with the wife and an evening in the amusements at the seaside where she (not me, I’m useless) won a cuddly toy.
