[4] He was one of the first philatelists to take a serious interest in perfins (stamps perforated with firms' initials), about which he published a book in 1933.

It was transferred to the basement of Vallancey's "Philately House" premises in St Bride Street, London, where it was catalogued by L.N.

On 10 May 1941, however, a German bomb completely destroyed Philately House, taking Vallancey's business and the remains of the Bacon library with it.

[1] Not long afterwards, in 1942, Vallancey sold his collection of British stamps by auction through Robson Lowe in a sale comprising 744 lots.

[5] After the war, Vallancey reestablished his business, working from home, but retired in 1948 due to ill health, selling his magazine stock to H. Garratt-Adams and the remainder, mainly books, to Ramsay Stewart (1931–66).