However , despite this Page received his letter of appointment in April 1945 .
During these discussions Page was openly critical of Westland and Petter 's designs such as the Whirlwind and Welkin .
Despite this Page received Petter 's letter of appointment in April 1945 .
During these discussions Page was openly critical of Westland and Petter 's designs such as the Whirlwind and Welkin .