What supports the claim that British designers considered American reactions?

Are there archival records showing that British designers tried not to upset the Americans before Queen Elizabeth?

No explicit archival record is identified here. The interpretation relies on personal references and inference from other discussions.

No archival record is identified that explicitly establishes a policy of avoiding offence to the Americans during Queen Elizabeth's development. The explanation rests on personal references and inference from surrounding discussions. Official records can preserve a meeting's decisions without preserving the arguments that led to them. Selective minutes and missing discussions therefore limit how firmly the policy can be reconstructed.