I think the (in fact entirely hypothetical?) examples where you were expecting to be asked for even greater sums are cheating.

That was my thought. Though it's hard to give firm criteria. For that matter, simply getting a good deal (your mercedes is on its way, Mister Tatham,) could be pleasing, the point about conveyancing is it's particularly pleasing because you were waiting around waiting and hoping for this.

Ooh, I got one. If i companies each have i employees ring you up and charge you £n0,000...