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There might have been a party wall agreement drawn up with the previous owner of your place but you should have been made aware during the sale.
I'm phoning our soliciter today because we drew up an agreement with the owner of the semi next door who passed away before it was actually wet signed. The executors (and beneficiaries) have consented and signed and we've been assured it's all hunky dory but they've sold the place already and I don't want any nasty surprises with the family moving in.
https://planning.walthamforest.gov.uk/Planning/lg/GFPlanningSearchResults.page
Plan is to try and speak with the builders tomorrow, to see if I can get the owners number