RE: NN Transactions , I think it’s us6 Nov 2020 16:28
Remember that special dispensation has been granted by the takeover panel to keep the buyers identity secret, this matches with your theory that normally NN are happy to disclose who they are transacting with.
RNS: Statement re Formal Sale Process 01/07/2020
"The Takeover Panel has granted a dispensation from the requirements of Rules 2.4(a), 2.4(b) and 2.6(a) of the Takeover Code such that any interested party participating in the formal sale process will not be required to be publicly identified as a result of this announcement and will not be subject to the 28 day deadline referred to in Rule 2.6(a) of the Takeover Code for so long as it is participating in the formal sale process. Following this announcement, the Company is now considered to be in an "offer period" as defined in the Takeover Code, and the dealing disclosure requirements listed below will apply"