Will a TR1 without transferee signatures be accepted?

We purchased a property early on October 2025 and upon chasing our solicitor we were told the TR1 was submitted the same month. We queried this, as at that time we had not been asked to sign a TR1. We were told that "This application can be lodged using the seller’s signed TR1, which is why we previously shared the Land Registry application receipt with you.". Knowing how HMLR is [rightly] fastidious, I have doubts that this statement is correct. Can you clarify whether a TR1 is acceptable without transferee signatures? Thank you.

Dave - a TR1 must always be executed by the Transferor. However it is not always necessary for the Transferee to do so as well Generally speaking a Transferee need only execute the Transfer if additional provisions/covenants have been added https://www.gov.uk/government/publications/registered-titles-whole-transfer-tr1/guidance-completing-form-tr1-for-the-transfer-of-registered-property#how-to-complete-panels-in-form-tr1