I used LBP a couple of years ago and found them quite good, but how deep do you need to go? One bloke that I know, when doing his first electrics oral (he is A&C), was asked about electrical theroy very deeply, and couldn't remember what a coulomb was. He bombed his first oral but passed on his second attempt with a different survayor. But do you really need to know what a coulomb is when you are changing a light bulb?
Oh and by the way, Hi Eddy, you took your time on guessing my ID. Thought you had me sussed months ago. See you on Monday.