DVLA developed a service known as MyLicence which lets insurers see your driving records automaically and so they say give you a more accurate quote based on your records. They say it removes errors inputting the information yourself, such as speeding points etc!!. However it is not mandatory to input you licence number.
Personally I’m more than capable of inputting any information correctly and would never give my licence number on compare sites for security reasons.
have a search for DVLA MyLicence 🙂