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If they didnt know, that is one matter, but if they did and lied to you, then that is a breach of contract.
So if they knew of this, then it should have been disclosed.
Can I clarify anything for you about this today, please?
If not, I would appreciate a 5-star rating for my answer. If you need anything further I am available for a follow up at no extra cost.
It does not breach Data Protection. That is only where you disclose the names/addresses's etc.
They should have disclosed it - no different if you are buying a property and asked if you have ever had problems with neighbours.
Does that assist?