Good Evening I wonder if you can advise me. I was left a

Good Evening
I wonder if you can advise me. I was left a property under a Will, the executor and I have never got on so it has been very difficult and taken a long time to sort out. The final agreement with him was that I would register with Land Registry the Transfer document his solicitor had prepared. I was fine with this and duly filed the appropriate documents in July. Land Registry had one or two queries which I answered and then I got a final letter from them saying that when the property was first registered by the Executor in 2013 he had failed to comply properly with ID requirements. As I was now the person filing the transfer this now became my problem to sort out. They gave me until 7/12.
I went through his solicitors to ask them to contact him and they would only do so if I paid their fees of £240 to complete a form ID1. I did pay this over. Nothing further has happened and Land Registry say if I don’t file the ID1 before 7/12 they will reject the transfer application and I will not be the new owner.
I am at a loss at this. When we were talking about me receiving the property I did the online check with Land Registry and downloaded the Who Owns the Property bit that clearly showed registration in 2013 by the Executor. I would have thought it should have been checked and found to be incorrect in 2013 and not visited upon me now in 2015. I did mention this to the Land Registry person who said no it was for me to deal with. If the Executor will not comply what can I do if anything.
Any suggestions on my position would be much appreciated.
Thank you