Hello and thanks for using Just Answer.
My name is ***** ***** am happy to assist you with your enquiry.
1. The Agent is under no obligation to disclose the Vendor's Solicitors details to your Solicitor, unless a Sale has been agreed, and in which circumstances they would issue a Memorandum of Sale confirming the names of the parties and their Solicitors. In all other circumstances, the Agents would be breaching confidentiality if they did disclose a Vendors Solicitors details to a third party.
2. You could contact the Vendors directly, by 2 methods. You could write a letter and post it through the letter box. If the property is empty, it may be some while before the Personal Reps attend again,so this may not be the quickest contact method.
Alternatively, your Solicitor can do an online search at the Land Regstry to find the full name of the deceased owner, and then he or you can do a postal search at Leeds Probate Registry for a copy of the Probate, which is a public document. The copy Probate, which only costs a nominal sum, will disclose the full names and home addresses of the Personal Representatives.
I hope this assists but please let me know if you require any further clarification.