i had that but in my case plumbing lecturer was b and electrical aSurely in an ideal world the 2 should go hand in hand? There's a lecturer at my local college who I won't name, his knowledge is vast, what he doesn't know probably isn't worth knowing. He is one of the most boring people I have ever met though. His lessons are a yawnfest.
One of his colleagues also has a vast amount of knowledge but he's as mad as a box of cats, you get a laugh in his lessons so you're enjoying yourself when you're in there. Lecturer B is a lot more popular than lecturer A.