What it means, WLTP is the newest worldwide emissions standard. usually only newer and higher-end cars, but most recent hybrids.
 

Benefits, If your car is Petrol/Hybrid, WLTP CO2 may be lower than the CO2 shown on the car's DVLA V5C. There are VRT import tax savings in this case.

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Call Us if you Need to, ICOC-ROI WLTP  is at €249