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Explanation: if this is a purchaser and vendor of land scenario. The vendor will be in default at the end of the notice period if s/he doesn't complete.
Otherwise, serve with notice to pay etc.
The Eng & Wales Law Society's Standard Conds. of Sale of Land switched - 20 years ago - from the National Conds. of Sale of Land to the user-friendlier buyer-seller.
Eng. & Wales Law Society's Standard Conditions of Conveyance on Sale, latest ed.