It's a mystery

Now you know I'm not talking about Toyah because there wasn't any semblance of a lisp in the title. However, there is a mystery in our house. A strange smell was coming from under the sink and so it was felt that we should investigate the sink.

We did

After taking off the u-bend we found a slight blockage caused by a small painting brush. Now which young son member of the household uses small brushes to paint his miniature models? A brush can't accidentally get flushed down a sink, it needs to be held upright and dropped.