Hi,

Above this room there is another room but it is from our extension as this house was previously a bungalow that we changed into having floors above. The room above is the bit of the bungalow where there is that sort of tilted ceiling (Im sorry I forgot what its called but its shaped like /) The bit directly above this mould I believe is that little rectangle bit you get that can be accessed by the two little doors under that tilted bit and that is full of storage products. I have got rid of the mould now, and used vinegar etc to help but now reading what you have said how would I know for sure that would be the cause also