Re: Victory Day Certificates.
Neither I nor my elder brother received one of these although we had been schooled in Sussex during the War years.
Re: Sidcot suits.
These were still in use in 1951/52 at RAF Swanton Morley although the 'inner suit' was rather too bulky to be worn in the confines of a Proctor. The only recollection I have of them is when two students were out on a motor-cycle while wearing them and had an accident. Redesigned the suits in the modern manner of 'ripped jeans'.