Apparently FMP go through the records every few weeks using the GRO and open up closed records were a death has been recorded. Researchers can also request that a record is opened by producing a death certificate for the person in question.
Ancestry will still be using the original register obtained from TNA and will not have opened any records as yet.
The Register was continually updated while National Registration was in force, when it was a legal requirement to notify the registration authorities of any change of name or address. This ended in 1952, but since 1948 the Register had also been used by the National Health Service, who continued updating the records until 1991, when paper-based record keeping was discontinued.
If you put your email in the box provided, I will send you a copy. Or contact me on my email and I will reply to you if you don't want to disclose your email address.