In replies to the Completion Information and Undertakings Form TA13, the seller's lawyer has given a professional undertaking. What is the nature of that undertaking?

• A. The buyer's solicitor will register the title
• B. The seller's lawyer will discharge the existing mortgage forthwith on completion
• C. The lender will release funds on demand
• D. The property will be re-registered

Answer: (B)

In property transactions, the Completion Information and Undertakings Form TA13 records promises the seller’s lawyer makes to smooth the handover at completion. The essential undertaking here is that the seller’s lawyer will discharge the existing mortgage on the property forthwith on completion. This means, the moment completion happens, the mortgage is paid off and a discharge document is provided so the buyer’s title can be transferred free of that mortgage.

This is the best answer because clearing any existing mortgage is what gives the buyer a clean title and prevents the seller’s mortgage from lingering on the chain or in the Land Registry record. The other options involve actions by different parties or non-encumbrance-related steps, such as the lender releasing funds or the buyer’s solicitor handling title registration, which are not the seller’s undertaking in TA13.