If you have informed and been informed and can provide evidence as such then that is reasonable in the eyes of the law. As long as the seller can provide evidence then that's fine.
AND MY STANCE IS THAT THE SELLER SHOULD ALWAYS INFORM THE BUYER OF DEFFICIENCIES.
Otherwise how are "barn finds" sold, MOT failures, projects, £50 trailers in need of repair?
Nobody expects the buyer to actually run them home simply because it's a vehicle.
But some idiots do. Then they try and apportion the blame for their dodginess onto righteous and just citizens.