Arthur Annesley (X) was the eldest son of Arthur (IX). It was he who erected the modern Bletchingdon Park in the 1780s. Wing in his "Annals of Bletchingdon" depicts Arthur (X) as being famous for his riding skills, and for his charity. He was M.P. for Oxford in 1790-1796.
Arthur (X) did much to rationalise his several estates. He sold the Huntingdon and Yorkshire properties (see E6/8/6D and E6/12), as well as some Irish lands (see E6/7/10D), but instead bought land in Oxfordshire (see E6/3/7D-8D, 11D-14D & 18D, E6/4/1D and E6/5/1D, including the manor of Hampton Poyle, which Arthur (III) had bought and then sold.
NOTE: The Aplin and Hunt papers include a copy of the will of Arthur (X)'s wife Catherine (nee Hardy), as well as several papers concerning the Hardy family.
SL11/1/2L/1 is a deed of 1781, whereby Arthur (X) agrees to set aside portions for his younger siblings Francis, Ann and Elizabeth, who were left without any money after their father Arthur (IX) died, because he made no will.