"an engineer is the guy who comes to fix your central heating"
No, that's a technician or a fitter. A engineer would be a guy who designed a central heating system and specified the parts and methods needed to install it.
I HATE the fact that my job title is "IT engineer", when in actual fact I'm a delivery boy. I turn up on site, take new PC out of box, put old PC in box, leave site. That's ***NOT*** engineering!!!!!