The people making them were German Speaking Czechs from the Sudetenland who had fled the Russian occupation which happened at the end of the second world war.
This was a collective of factories under communist control making all sorts of brass and woodwind instruments. VMI was based in Markneukirchen and is now known as B&S. Sometime in the 1960's Boosey & Hawkes had the opportunity to buy in budget priced instruments from Eastern Europe - mainly from VMI of the GDR (East Germany) and later Amati of Czechoslovakia. LaFleur was maintained as a separate company until the 1930's. Boosey merged with Riviere & Hawkes in 1930 to become Boosey & Hawkes. ".R LaFleur & Son were an instrument maker founded in London in 1862 who were acquired by Boosey & Co in 1917.