Geograph - photograph every grid square

The church of All Saints in Wing dates back to the 9th century, and much of the surviving structure is of Saxon origin. This makes it one of the oldest extant buildings in Britain.
The oldest part of this remarkable church is the crypt beneath the slightly later apsidal chancel. According to Pevsner (Buildings of England:Buckinghamshire) this crypt is probably of the C9th. The EH (Grade I) listing Link states of the church "Originally C10 with nave, N. aisle, chancel and crypt surviving from this period. Probably built for Aelfgifa, sister-in-law to King Eadgar."
North and South Aisles were added (or remodelled) in the C14th and C15th, though the north wall of the North Aisle is also of Saxon origin. The Tower and South Porch were added in the C15th, and a North Porch added in more modern times (Victorian probably). There is a helpful plan of the church here Link
See also the VCH write-up here Link
The Church of England's own page about the church can be seen here Link
Parish website Link

Note there is a separate Shared Description for the fonts themselves Link
This is a photo-linking snippet about the churches that house them.
Note: The number of these fonts is reckoned as either 22 or 23 as the example at Wing retains only its base.

The following 23 churches contain "Aylesbury" fonts - though the final one (at Wing) retains only its base.

Aylesbury, Bucks - St Mary's - C13th - EH Grade I Link Church website Link

Barton-le-Clay, Beds - St Nicholas - C12th-15th - EH Grade I Link Church website Link

Bledlow, Bucks - Holy Trinity - C12th-13th - EH Grade I Link Church website Link
Information and photos of the church (local parish website) Link

Buckland, Bucks - All Saints - C13th-16th - EH Grade II* Link Church websites Link and Link

Chearsley, Bucks - St Nicholas - C12th-13th - EH Grade II* Link Church website Link

Chenies, Bucks - St Michael - C15th - EH Grade I Link Church website Link Attached to the church is the Bedford Chapel Link the family mausoleum of the Russell family, Dukes of Bedford. It is not normally open to the public.

Dinton, Bucks - SS Peter & Paul - C12th-15th - EH Grade I Link Church website Link

Duston, Nhants - St Luke - C12th-14th - EH Grade I Link Church website Link

Eydon, Nhants - St Nicholas - C13th-14th - EH Grade II* Link (with 14 other listed monuments etc in is churchyard) Church website Link

Flitwick, Beds - SS Peter & Paul - C12th,14th & 16th - EH Grade I Link Church website Link

Great Hampden, Bucks - St Mary Magdalen - C13th-15th - EH Grade II* Link Church on bridleway not road. Church website Link
Adjacent to magnificent Hampden House ( Grade I Link )

Great Kimble, Bucks - St Nicholas - C13th-14th - EH Grade I Link Victoria Histories entry Link Church website (minimal) Link

Great Missenden, Bucks - SS Peter & Paul - C14th - EH Grade I Link Church website Link

Haddenham, Bucks - St Mary the Virgin - C12th-13th - EH Grade I Link Church website Link

Houghton Regis, Beds - All Saints - C14th - EH Grade I Link Church website Link

Little Missenden - St John the Baptist - C10th-14th (Saxon core) - EH Grade I Link Church website Link

Ludgershall - St Mary the Virgin - C14-15th - EH Grade I Link Church website Link

Monks Risborough - St Dunstans - C14th-15th - EH Grade I Link Church website Link

Old Linslade, Beds* - St Mary's - C12th,14th&15th (Norman core) - EH Grade I Link Church website Link

Pitstone - St Mary the Virgin - C13th - EH Grade I Link Redundant church in care of CCT Link

Saunderton - SS Mary & Nicholas - C19th after C12th-14th church destroyed by fire. - EH Grade II* Link Church website Link

Weston Turville - St Mary the Virgin - C13th-15th - EH Grade I Link Church website Link

Wing - All Saints - (Only base remains) - C10th - EH Grade I Link Church dating back to Saxon period with famous Saxon crypt. Church website Link

*(Old Linslade used to be in Bucks)