1939 Royal Air Force structure open mainly for pre-booked weekday tours and on some weekends. The Battle of Britain Bunker offers a variety of spaces for hire, suitable for a range of events including meetings, corporate receptions, launches, and children's birthday parties. The exhibition hall can accommodate up to 200 people for a canapé reception, while the visitor centre includes meeting rooms, a lecture theatre, and the entire visitor centre for larger events. The Bunker Briefing Room is ideal for small gatherings, and the grounds, gardens, and entire site are also available for hire. The venue provides catering options for day and evening events, with a partnership with Daisy's to offer a range of catering options. Additionally, private tours of the bunker can be arranged for up to 40 people. The site is equipped to host outdoor events and offers a unique experience for those seeking an underground space for top secret meetings or events. For more information and specific requirements, email bunker@hillingdon.gov.uk.