[1] Pecche was a successful merchant and member of the influential Fishmongers who accumulated landed estates spread through half a dozen counties including Kent, Surrey, Cambridgeshire and Middlesex and substantial properties in three parishes in the city of London.
[2] Granted by Edward III a monopoly of the sale of sweet wines in London in 1373 he was impeached for taking on each pipe a levy of 3s.4d.
In August 1376 Pecche lost his rank as an alderman and his freedom of the City.
Pecche was a feudal tenant of John of Gaunt and also had business dealings with him and Gaunt's influence gained John Pecche a royal pardon together with Parliament's reversal of the judgment in January 1377.
His widow, his wife Mary, married Sir William Moigne.