A list of (possibly) non-vegan E-codes (based on wikipedia: http://www.wikipedia.org/wiki/E_number)

AO - animal origin
LGM - likely to be genetically modified
PAR - possible allergic reaction


E120 Cochineal, Carminic acid, Carmines, Natural Red 4 (food colouring) [PAR] [AO] [BAC]
E153 Carbon black, Vegetable carbon (food colouring) [LGM] [possibly of AO]
E161g Canthaxanthin (food colouring) [possibly of AO]
E161h Zeaxanthin (food colouring) [possibly of AO]
E161i Citranaxanthin (food colouring) [possibly of AO]
E161j Astaxanthin (food colouring) [possibly of AO]
E252 Potassium nitrate (Saltpetre) (preservative) [possibly of AO] [BAC]
E270 Lactic acid (preservative) (acid) (antioxidant) [possibly of AO]
E322 Lecithin (emulsifier)[LGM] [possibly of AO]
E325 Sodium lactate (antioxidant) [possibly of AO]
E326 Potassium lactate (antioxidant) (acidity regulator) [possibly of AO]
E327 Calcium lactate (antioxidant) [possibly of AO]
E422 Glycerol (emulsifier) (sweetener) [possibly of AO]
E430 Polyoxyethene (8) stearate (emulsifier) (stabiliser) [PAR] [possibly of AO]
E431 Polyoxyethene (40) stearate (emulsifier) [possibly of AO]
E432 Polyoxyethene (20) sorbitan monolaurate (polysorbate 20) (emulsifier) [possibly of AO]
E433 Polyoxyethene (20) sorbitan monooleate (polysorbate 80) (emulsifier) [possibly of AO]
E434 Polyoxyethene (20) sorbitan monopalmitate (polysorbate 40) (emulsifier) [possibly of AO]
E435 Polyoxyethene (20) sorbitan monostearate (polysorbate 60) (emulsifier) [possibly of AO]
E436 Polyoxyethene (20) sorbitan tristearate (polysorbate 65) (emulsifier) [possibly of AO]
E441 Gelatine (emulsifier) (gelling agent) [AO]
E442 Ammonium phosphatides (emulsifier) [possibly of AO]
E470a Sodium, potassium and calcium salts of fatty acids (emulsifier) (anti-caking agent) [possibly of AO]
E470b Magnesium salts of fatty acids (emulsifier) (anti-caking agent) [possibly of AO]
E471 Mono- and diglycerides of fatty acids (glyceryl monostearate, glyceryl distearate) (emulsifier) [LGM] [possibly of AO]
E472a Acetic acid esters of mono- and diglycerides of fatty acids (emulsifier) [possibly GM] [possibly of AO]
E472b Lactic acid esters of mono- and diglycerides of fatty acids (emulsifier) [possibly of AO]
E472c Citric acid esters of mono- and diglycerides of fatty acids (emulsifier) [possibly of AO]
E472d Tartaric acid esters of mono- and diglycerides of fatty acids (emulsifier) [possibly of AO]
E472e Mono- and diacetyl tartaric acid esters of mono- and diglycerides of fatty acids (emulsifier) [possibly of AO]
E472f Mixed acetic and tartaric acid esters of mono- and diglycerides of fatty acids (emulsifier) [possibly of AO]
E473 Sucrose esters of fatty acids (emulsifier) [possibly GM] [possibly of AO]
E474 Sucroglycerides (emulsifier) [possibly of AO]
E475 Polyglycerol esters of fatty acids (emulsifier) [possibly GM] [possibly of AO]
E476 Polyglycerol polyricinoleate (emulsifier) [possibly GM] [possibly of AO]
E477 Propane-1, 2-diol esters of fatty acids, propylene glycol esters of fatty acids (emulsifier) [possibly GM] [possibly of AO]
E478 Lactylated fatty acid esters of glycerol and propane-1 (emulsifier) [possibly of AO]
E479b Thermally oxidized soya bean oil interacted with mono- and diglycerides of fatty acids (emulsifier) [LGM] [possibly of AO]
E481 Sodium stearoyl-2-lactylate (emulsifier) [possibly of AO]
E482 Calcium stearoyl-2-lactylate (emulsifier) [possibly of AO]
E483 Stearyl tartrate (emulsifier) [possibly of AO]
E491 Sorbitan monostearate (emulsifier) [possibly GM] [possibly of AO]
E492 Sorbitan tristearate (emulsifier) [possibly of AO]
E493 Sorbitan monolaurate (emulsifier) [possibly of AO]
E494 Sorbitan monooleate (emulsifier) [possibly of AO]
E495 Sorbitan monopalmitate (emulsifier) [possibly of AO]
E542 Bone phosphate (anti-caking agent) [AO]
E570 Stearic acid (Fatty acid) (anti-caking agent) [possibly GM] [possibly of AO]
E572 Magnesium stearate, calcium stearate (emulsifier) (anti-caking agent) [possibly GM] [possibly of AO]
E585 Ferrous lactate (food colouring) [possibly of AO]
E627 Disodium guanylate, sodium guanylate (flavour enhancer) [possibly of AO]
E631 Disodium inosinate (flavour enhancer) [possibly of AO]
E635 Disodium 5'-ribonucleotides (flavour enhancer) [possibly of AO]
E640 Glycine and its sodium salt (flavour enhancer) [possibly of AO]
E901 Beeswax , white and yellow (glazing agent)[PAR] [AO]
E904 Shellac (glazing agent) [AO]
E910 L-cysteine [AO]
E913 Lanolin, sheep wool grease (glazing agent) [AO]
E920 L-cysteine (improving agent) [AO]
E921 L-cystine (improving agent) [AO]
E966 Lactitol (sweetener) [AO]