"Poor communication between primary and secondary care"

I was finding it difficult to get to the Anticoagulation Clinic, so switched my approach to having my local health centre in Surbiton take my blood and send it with my yellow book to the clinic for dosage checking.

Out of the blue I receive the following letter from a consultant:

"Our computer records show that you have failed to keep 3 appointments for the Anticoagulation Clinic. It is dangerous for you to remain on warfarin without the necessary checks. I have written to your GP today, advising him/her to stop supplying you with warfarin unless you have your blood checked."

Now, 1 - I have my blood taken by the surgery; 2 - threatening to stop my warfarin, given my polycythemia, and the 3 DVTs I have had would be dangerous for me and seems a ludicrous threat to issue.