 Nyorai kupfuurira kweiyi ndima - Kubva muna Chikunguru 1936 zvichienda mberi, mimwe mirairo yakawedzerwa yakaiswa ye Blenheim Mk I, kusanganisira mirairo yakawanda yemusika wekutengesa kunze. Pakupera kwa1936, ndege 1.568 dzakanga dzarayirwa. Kuti vasangane nezvinodikanwa, mitsetse yokuunganidza yechipiri yakaiswa paChadderton neAvro uye paSpeke neRootes Securities. Ndege yakavakwa pasi rezinesi nenyika mhiri kwemakungwa, kusanganisira Finland, uyo akapedza dzinokwana 55 ndege, uye Yugoslavia, iro rakapedza 16 ndege pamwe mamwe 24 mune mberi mumatanho kupera apo Germany akapinda Yugoslavia.. Dzimwe nyika dzakatengawo Blenheim, kusanganisira Romania, Greece neTurkey. Pakazosvika September 1939, maodha eBlenheim akanga akwira kusvika ku 2,088 ndege. Total kugadzirwa Blenheim Mk I muEngland aiva 1,351 ndege pamberi kuguma kugadzirwa run muna 1939; kugadzirwa akanga aguma mukufarira zvikuru yepamusoro dzomutauro. 