interlinked smoke alarm

I have six Aico smoke alarms interconnected with 4-core cable. I would now like to add the Aico alarm control / test switch (Ei1529RC). https://www.aico.co.uk/product/ei1529rc-hard-wired-alarm-control-switch/ Would 3094Y cable (4-core 0.75mm²) be sufficient?

I’ve just built a double storey extension to the side of the house. I installed a Kidde dual smoke + Carbon mono alarm, one upstairs and one downstairs. Now I’ve 4 bed house (and its not being rented). I had the pleasure of building reg inspector doing the final visit and after calling his...