Sorry but I can see now how my post could have been taken two ways..
There is actually two separate T and Es from the existing switch position, one to each CU.
The neutrals are linked at the switch as it is only a single pole switch (like a two way light switch).
I ha e orders a Horstmann E7 as it look perfect for the job, the only danger I can see is that il have to label it to ooont out that it needs to be isolated at both CUs to work in it.
thanks for all the input chaps, I sometimes even know such a switch existed so I’m very grateful for the input!
There is actually two separate T and Es from the existing switch position, one to each CU.
The neutrals are linked at the switch as it is only a single pole switch (like a two way light switch).
I ha e orders a Horstmann E7 as it look perfect for the job, the only danger I can see is that il have to label it to ooont out that it needs to be isolated at both CUs to work in it.
thanks for all the input chaps, I sometimes even know such a switch existed so I’m very grateful for the input!