Below is a (hopefully!) comprehensive list of the advertising liveries carried
4002 - Braathens Airline, Metro Website
4008 - Royal Quays
4012 - Crimestoppers
4016 - Metro Radio
4020 - Modern Apprenticeships
4026 - Braathens Airline
4027 - Dinosaurs At The Hancock, Segedunum, DFDS
4033 - Emirates Airline (2 versions)
4034 - JJ Whitley
4038 - Talk To Frank, Thomson Holidays, East Coast Trains
4039 - Metro FM, Journal
4040 - Cut Your CO2, Emirates Airline (2 versions)
4042 - Chronicle, Metro Radio
4045 - Metro FM, Grey "Advertise On Metro", Newcastle Racecourse, Newcastle Airport
4048 - Great North Forest
4049 - Orange, Kidd & Spoor Harper Solicitors
4050 - Northumbria Police
4051 - Asda
4054 - Metroland
4055 - Grey "Advertise On Metro, GNER, European Union
4056 - M&S, Woodpecker Cider
4058 - Metroland
4061 - Connexions
4063 - Woodpecker Cider
4067 - Alexander Millar Artwork
4068 - Bridges Shopping Centre
4075 - Tyne & Wear Services
4080 - National Garden Festival, Tyne & Wear Challenge, South Shields Market
4082 - Emirates Airline (2 versions)
4083 - British Lung Foundation, Emirates (2 versions)
4084 - Pop Card, East Coast Trains
4085 - Newcastle/Gateshead Buzzin', BBC Radio Newcastle
4086 - Tesco Extra, DFDS
4087 - M&S, Grey "Advertise On Metro", Seaside Special/South Tyneside, Millennium Festival
There have also been other special/heritage liveries
4001 - Original 1975 livery, 40th Anniversary livery
4027 - NER
4032 - Golden Jubilee
4044 - Yellow (Brandling Junction)
4051 - Claret (Newcastle & North Shields Railway)
There has also been a few instances of units having promotional stickers applied, rather than a full livery
4001 - ITV Telethon
4002 - ITV Telethon
4039 - Monergy '86
4045 - Monergy '86
4053 - Dance Festival