It's an another daft decision by our utterly rubbish and not fit for purpose government. This time the DfT being [censored] stupid and using data protection as an excuse.
I think this needs an independent citation - not the answer published by one.network themselves.
*Clearly* it's in one.network's interest to withhold this information from the public, to ensure that their customers (councils etc) cough up for a full subscription. As you say, data protection is just an excuse - this is not *personal* data.