“…n. Clearly, they all contemplate a serious interference before the principle is engaged. That is consonant with what Lord Millett said in Southwark LBC v Mills [2001] 1 AC 1, 23. Having said that there was little difference between derogation from grant and breach of the covenant for quiet enjoyment he said:…”
“…ng at the highest level (see, for example, Cambridge Water Co. v Eastern Counties Leather plc [1994] 2 AC 264 at 299, Southwark London Borough Council v Tanner [2001] 1 AC 1 at 15-16, 20) Bramwell B said (at p.83):…”