Plastic Choc Blocks used to join cables

[ChrisS]

In a retirement complex with 67 flats we have recently had a fire alarm system upgrade. We have had a new fire panel, removed fire bells from flats as the fire risk assessment said as we are a stay put site we shouldn't have them and replaced the bells in the corridors with sounders. Existing cabling was used. Where the bells have been removed from the flats the remaining cable has been joined using plastic choc blocks. These are (mostly) inside the existing round metal conduit junction box but without a lid. This is fixed to the wall and the plaster board is dabbed onto the wall leaving a gap between. Then on the flat side (apartment side) of the plaster board a metal plate has been fitted using the fixing holes of the original junction box. This results in a gap between this plate and the upper edge of the junction box. The installer says this is still classed as an enclosed metal box as fire cannot get in. Is it? Is it a fire proof situation? Is the system compliant? We have a modifications certificate.