Nice summary, littlep. The bit about having Southwark's own party wall surveyor handle your side too is key - no possibility of misunderstandings, mis-communications, and disagreements between surveyors, so overall a smoother ride and probably slightly lower costs too. An earlier post recommends a Southwark-supplied document that guides you through the party wall legal process (and the associated 6-metre process, I think it's called). A word of caution for anyone considering that. If it's the same doc we used, created by John Prescott when he headed the Office of the Prime Minister about 10 years ago, beware that some of the details in it are incorrect. We relied on that doc for a legal matter in the small claims court. The case turned on one of those details, and we lost because the doc was wrong - well, insufficiently precise compared with the Party Wall Act 1996 might be kinder... A small point, but one that's always riled so I thought I'd mention in case it helps.