implicity

gives the percentages of each ingredient used:

• malted brown bread (42%)
• sweetcure smoke flavoured bacon (17%)
• tomato (17%)
• iceberg lettuce (11%)
• seasoned mayonnaise (10%)
• butter (not stated but presumably 3% +/- rounding errors)

malted brown bread contains:

wheat flour; water; malted wheat flakes; wheat bran; malted wheat and barley flours; yeast; salt; wheat protein; spirit vinegar; vegetable fat; emulsifiers: mono- and di-acetyltartaric esters of mono- and di-glycerides of fatty acids, mono- and di-glycerides of fatty acids, sodium stearoyl lactylate; flour treatment agent: ascorbic acid.

sweetcure 'smoke flavoured' bacon contains:

pork belly; sugar; salt; 'smoke flavouring'; malt extract; emulsifier: sodium triphosphate: preservative: sodium nitrite

seasoned mayonnaise contains:

vegetable oil; pasteurised egg; non brewed condiment; salt; sugar; pepper; stabilisers: guar gum, xanthan gum, carob bean gum; mustard flour; preservative: sorbic acid