I once began a lecture to the Pyramus and Thisbe Club (which, as you doubtless know, is the organisation which all Party Wall surveyors belong to, have applied to join, or should aspire to) by saying that easements were something which they should have nothing to do with. I am not at all sure that the same is not true of surveyors in general, and that just as the House of the Tragic Poet at Pompeii has (or, at any rate, had until the late earthquake) cave canem written at the doorway, so should all instructions to surveyors concerned with development have written at their head ‘Beware of the Easements.’