Plumb out of luck

Is it too much to ask of people that they should do as they say? It's a lesson I'm sure I learned early on in life, and I like to believe I've held myself to it although I'm sure I've lapsed more than I'd care to remember.

Say what you mean or you won't mean what you say I was taught. The plumber said he'd turn up on Friday and didn't. The plumber said he'd turn up today and didn't. The plumber said he'd turn up tomorrow morning and... well, that's still to be confirmed. Suffice it to say that despite it all I'm mildly hopeful. Time will tell whether my hope is justified...