I suppose the 'privacy restriction' means, having the actual images on view - its a 'jobsworth' rule, because obviously you can transcribe stuff yourself and then put as much info as you like online - for example the latest batch of transcriptions on the Lancashire OPC (who I do a bit of transcribing for) includes Burnley Cemetery burials right up to this year. I think thecohens is right, its a fobbing off answer with some other issue behind it.
Slightly off-topic, but when I went to the LRO a while back, I was told that some of their baptism registers (actual ones that have not been microfilmed ) were closed from about 1930 onwards. "Its because there are some adoption details in them" they said. But I was fine searching 1912 to 1929, which of course is less than 100 years ago...
but thanks for the info Parmesan, Footo and Lord V

Barbara