This is a fantastic tool, I hope that eventually all batch plants can be added to the map!
Low carbon concrete starts with the specification, and generally speaking most concrete plants will be able to produce low(er) eCO2 mixes by reducing the cement content for example by delaying the date of strength acceptance, using larger aggregate with good grading, and increasing the SCM content. The earlier you get the batch plant involved the easier it will be to drive the CO2 emissions down.