Large pub partitioned into many areas and booths, both small and large. Well-decorated, with pale grey part-panelling with many appropriate pictures and signs, including some linked to nearby Bletchley Park. The Three Trees is designed for relaxed eating with only a small bar, but there is ample outside space with many tables, including some covered, some heated and a small outside bar for busy summer days. The small bar has three handpumps, with one regular ale and, occasionally, a second, plus the usual keg beerr and lagers. It also has a Gin menu, including four local Bucks Brothers gins. There is a wide-ranging "home-cooked" Great British Inns menu, including carvery and separate menus for vegans, children and bar snacks & meals. The pub offers an OAP and an over-55 discount scheme.