Hi everyone,   Looking for some advice on insulating the cavity of an existing beam and block sub floor. Our property was originally built ~1990 and is located in Edinburgh, Scotland. I’ve included a sketch of the current and proposed arrangements.   There is currently no access to the void space. I have managed a limited inspection of the void by fitting a GoPro through a penetration the last owners made in one of the blocks. There is currently a ventilated void of 300 to 38