There's a little bit of info about it on the IMDb
I remember seeing a film of this title (short, Black & White) on TV in about 1990. I think Bernard Miles was in it. It relates to a man whose specialism is in building outside toilets!! It was obviously an adaptation of an obscure but very funny little book of the same name - (incredibly I found a copy in a s/h bookshop!!). I can find no trace of this film but would love to see it again or, better, get a video copy. Any suggestions??
Did you ever find a copy? I have been looking for one as well.