Bristol Blenheim I. 18 and 57 Squadrons were based at Upper Heyford with Blenheims when war broke out in 1939. Post author By Nick Forder Post date October 24, 2018 No Comments on Leave a Reply Cancel replyYour email address will not be published. Required fields are marked *Comment * Name * Email * Website Save my name, email, and website in this browser for the next time I comment. Δ