Found a new reference to Mrs. Mary White.
Definitely doesn't sound as if they were married, no.
An estate at Ludford
Lease and Release
Ayscoghe Boucherett of North Willingham, esq,
George Tennyson of the close of Lincoln and of Market Rasen,
John Julius Angerstein in the parish of Greenwich.
A messuage with homestead no. 44 of 5a. 0r. 38p. formerly in the occupation of John Patrick now of Thomas Cocking, a close of old enclosed meadow or pasture, the farrmill beck close of 9a. 1r. 22p., a close of old enclosed meadow or pasture called mill beck close no. 3 of 9a. 2r. 17p., a close of old enclosed meadow or pasture called the north close no. 8 of 2a. 1r. 30p., a tenement with yard known as (blank) all in Great Ludford; Brice's homestead no. 25 of 1a. 0r. 17p., and the lands allotted to Ayscoghe Boucherett in an award of enclosure of the lordships of Ludford dated 7 Feb 1785, namely allotment no. 139 of 2a. 0r. 16p., no. 140 of 3a. 1r. 24p., allotment no.135 of 369a. 2r. 15p., allotment no. 143 of 15a. 2r. 26p., close of ancient enclosed land called kiln garth no. 45 of 2a. 0r. 6p., allotment of land no. 138 of 21a. 3r. 18p., also plot no. 141 of 27a. 2r., all the grass and herbage of allotments 136 and 142 in Ludford Parva; five cottages in Ludford Magna now or late in the occupation of Thomas Cocking and his undertenants; all the messuages, lands etc of Ayscoghe Boucherett (excepting out of this sale the manor of Ludford and the advowson of the rectory or parsonage of Ludford St Peter or Little Ludford).
Consideration: the will of Ayscoghe Boucherett late of North Willingham under which all of his estates (except in Middlesex and the cities of London and Westminster, the advowson of the rectory of St Peter in Little Ludford and the vicarage and parsonage of North Willingham) were given and devised to Charles Chaplin, esq, and Thomas Lester esq., to various uses namely:
Great Ludford property that Mrs Mary White might receive an annuity of £300 for life.
Subject to this, for a term of 500 years to Charles Anderson Pelham, esq, now Charles Lord Yarborough and William Hildyard, esq, which is now vested in George Tennyson, to pay debts and funeral expenses of the testator if his personal estate fell short, to renew the lease of the rectory and parsonage of Stallingborough, for raising £10,000 for the testator's daughter Mary Boucherett, to the use of Ayscoghe Boucherett the son through any deed by which he might limit or appoint, and thereafter to Ayscoghe Boucherett in tail general, and he is to be the sole executor and residuary legatee, 15 Mar 1776
That Mary White died in the testator's lifetime, Charles Lord Yarborough beame the only survivor for the term of 500 years, Ayscoghe Boucherett the testator died 1789.
That Ayscoghe Boucherett the son and Mary survived, that the debts her portion, and fine for renewing the lease had been paid.
Reference made to the award of enclosure under the act of 31 Geo III, which named the allotments given above gave the following other particulars, that the allotments 139-140 were to the lord of the manor in lieu of waste; 140-141 are liable to a rent charge of £3 0s. 10d. payable to the rector of Ludford Parva; that numbers 135, 143, 45 and 138 with 139 and 4 ancient closes called the homestead, far mill beck close, near mill beck close and north close numbered 44,2,3, and 8 in Ludford Magna should be liable to the payment of £8 10s. 4d. to the vicar of the parish of Ludford Magna in lieu of vicarial tithes; that no. 141 should be subject to a bridle road near Girsby hedge leading from Girsby gate to the Watery lane which extends into Tows walk; that 141, 140 and Brice's homestead numbered 25 in Ludford Parva should be liable to the payments of £3 0s. 10d. to the rector of Ludford Parva in lieu of tithes; that the allotments subject as mentioned were allotted to Ayscoghe Boucherett under the Act in satisfaction and compensation for the several pieces of land dispersed in the fields which he held before the Act and for the rights of common held before the Act,also for two ancient enclosures called the south close no. 80 and the horse close no. 43 awarded to Robert Heneage, and for a close called Humbleton close no. 92 through which the turnpike road runs. The price to be £6,576 1s. 2d.
Signed and sealed Ayscoghe Boucherett and George Tennyson.
Physical Description: 7 skins.
Date: 5 Apr 1797
Repository: Lincolnshire Archives [057]
Date: 5 Apr 1797 WEBB/1/12-13
http://www.lincstothepast.com/Records/RecordDisplaySearchResults.aspx?oid=628274&mode=c