Thanks for the info, Tightturnaround.
It seems that the OAT route has now been sanctioned, so 'Direct Aberdeen' is on again. After saying that, this afternoons flight insisted on joining at SILVA, despite being offered 'dct ADN' twice. Not sure if there may be an advantage in the SILVA join, with regards to getting to cruise alt quicker. Depends on the traffic sitch at the time, and who is in the seat at Lon Mil I think, but the direct route is available.