Did parallel shipyards speed Queen Elizabeth construction?

Were Queen Elizabeth-class battleships built sequentially in one yard or in parallel across several yards?

They were distributed across five yards. Only Queen Elizabeth and the proposed Agincourt formed a sequential pair at Portsmouth.

Queen Elizabeth went to Portsmouth, Warspite to Devonport, Valiant to Fairfield, Barham to John Brown, and Malaya to Armstrong Whitworth. Spreading the class allowed Britain to use several public and private construction centers at once. Agincourt's assignment to Portsmouth should have benefited from the yard's fresh experience building the lead ship. Its delay therefore supports the circumstantial case that the sixth ship was not a straightforward repeat design.