cheers for advice so far kev... 
will have to make a hole in the bathroom ceiling and send up a periscope or something to see if there is another tank up there.
can't follow the pipe goes up into loft space that i can't get to!! stupid idea ...
when the extension (that has the bathroom) was added onto the original cottage, the only gap in the loft through to the new roof space has been blocked by the new chimney and the tiny tank that i've already found - no way to see through or past.
I may be some time getting to the bottom of this one..
thanks all
will have to make a hole in the bathroom ceiling and send up a periscope or something to see if there is another tank up there.
can't follow the pipe
goes up into loft space that i can't get to!! stupid idea ...when the extension (that has the bathroom) was added onto the original cottage, the only gap in the loft through to the new roof space has been blocked by the new chimney and the tiny tank that i've already found - no way to see through or past.
I may be some time getting to the bottom of this one..
thanks all
