Gunter was taken into partnership in 1777 by Domenico Negri who had opened a confectioner's shop in Berkeley Square, Mayfair, in 1757 under the sign of the Pot and Pine Apple.
Her defence was "Mr. Gunter has been a worthy master to me, I hope he will be favourable; he always behaved well to me" resulted in her receiving a fine of one shilling and six months in the House of Correction, while others convicted of similar crimes were sentenced to seven years transportation.
Gunter was ordered in 1805 to organise the catering and confectionary for a magnificent five day visit when the Marquess of Buckingham entertained the Prince of Wales and the Duke of Clarence at Stowe.
[4] Gunter decided to develop his own farms and market gardens to grow fruit which supplied his shop with the materials needed for his confectioners and cooks.
He also bought a large plot from William Boulton where in 1850 his son Robert I Gunter commenced the building of The Boltons, an exclusive residential area still in existence.