Soviet access to Eric Brown's aircraft reports

Do we know how the Soviets reacted to Eric Brown's reports on their aircraft after intelligence leaks by Burgess, Maclean, and others?

No clear reaction is given. The premise is uncertain: the leaked information may have come through later summaries rather than Brown's original test reports.

A specific Soviet reaction is not identified, and the assumption that Burgess and Maclean passed on many original flight-test reports is questioned. Brown's technical reports are described as remaining at the Royal Aircraft Establishment, while later summaries carried their findings toward the Ministry of Defence. Material leaked through diplomatic or intelligence channels could therefore be several reporting stages removed from the tests. Following that chain matters when assessing exactly what information reached an adversary. The archival caveat is that surviving summaries can refer to lower-level documents that are now missing.