This is correct James! as it seems to be cheaper co2 wise for Tescos than the local Newlyn supplier presumably cos of the distance to Newlyn. So: 2 options which you should include for Tescos getting the fish from Hull and from Falmouth. And the real option from Newlyn. Use the symbols of rejected option and the star if you can.
Tescos worst option: Hull to Birstall (Tesco distribution) 113 miles or 94.65 kg/co2
Birstall to Roborough (Plymouth) 250miles = 209.5kg/co2
Tescos best option: Falmouth to Roborough (Plymouth) 67 miles (van) = 17.6 kg/co2
Local Fish: Newlyn>Penryn>Plymouth 94 miles = 24.3 kg/co2
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