Will keep this live with the brands owned by major donors to the Leave cause or those whose media coverage is strongly biased pro leave. In the case of the latter, two examples; the BBC is not on the list since it at least attempts impartially; the Daily Mail is on the list since it has almost completely one sided coverage against Remain and the EU.
Argent Group Foyle (multiple food and food related products http://argent group companies citation https://www.google.co.uk/amp/s/amp.theguardian.com/politics/2015/oct/09/millionaire-donors-back-cross-party-campaign-to-leave-eu )
Blueberry Foods – deserts
Bradgate Bakery – supermarket salads, sandwiches and chilled foods
Brooksby Foods – ready meals
Château Léoube (funded by JCB MONEY).
C Hoare & Co
Daylesford Farm (funded by JCB money)
Dickinson & Morris
Dixon Carphone plc (due to Lord Kalms https://youtu.be/sqngjWJE4n0)
JML John Mills Limited
Jeeves of Belgravia (Timpson Group) ,
Johnson’s Dry Cleaning (Timpson Group)
Kensey Foods – deserts
Kettleby Foods – ready meals
Landrover (cosponsor Americas Cup)
Max Spiellmann (Timpson Group)
Melton Foods – upscale sandwiches
Odey Asset Management
Rocco Forte Hotels
Salad works – ready meals
ShoeCare (Timpson Group)
Snappy Snaps (Timpson Group)
Tamar Foods – many supermarket own label
Tate & Lyle
The Daily Mail and Mail on SundayT
The Daily Star
The Times and Sunday Times
Timpson Locksmiths (part of Timpsoms group)
Walker & Son – supermarket own label pork pies
Walkers Deli – many supermarkets though mostly at the largest one
Walkers Sausage Co
A special mention goes to Waitrose, a supermarket based mainly in the South East of England which derives a high proportion of it’s profits from London, a strongly remain voting city. Despite this, it still continues to support The Daily Mail, a publication of such despicable bias and predjudice that it deserves status on this list and on all general lists standing against hatred. For that reason, the author makes a special exception for Waitrose. Not a funder of Brexit directly, but one that should, due to the base of its customers, review its media partnerships. Until such time Waitrose is to be boycotted.
Update. An alternative detailed list exists here.
Update. Farage supporting advertisers here.