Tattershall Thorpe 17th century, with 19th- and 20th-century alterations. It is constructed of "mud and stud" and partly underbuilt with painted brick. It is a Grade II listed building, and houses RAF memorabilia from RAF Woodhall Spa, an active RAF Station during the Second World War. The Bluebell Inn has signatures on its ceiling from some of the members of 97, 619, 617 (Dambusters) and 627 Squadrons who frequented the pub. RAF personnel from the Battle of Britain Memorial Flight and Squadrons from RAF Coningsby sign to this day to continue the tradition. Wing Commander Guy Penrose Gibson VC, DSO, DFC and
No. 421 (Reconnaissance) Flight RAF were issued to 421 Flight and the Hurricanes went to other squadrons. No. 421 (Reconnaissance) Flight RAF No. 421 (Reconnaissance) Flight was a specialist RAF fighter flight created on 21 September 1940 to patrol the Channel and provide early warning of the types of incoming Luftwaffe raids from occupied France. It was later expanded to full squadron strength and renumbered as No. 91 Squadron on 11 January 1941. Its role led to its pilots being nicknamed "Jim Crows". In late September 1940, Air Chief Marshal Hugh Dowding was faced with two problems. The first was a change in Luftwaffe tactics.