Exact same happened to me about.. 2 weeks after i passed my test

spotted a big volvo rapidly approaching me i slowed to 70 (from about a ton) and knew they were gonna pull me

followed me for a mile, then put the lights on, pulled me and gave me the "what would you ahve done if.. a deer jumped out infront of you etc etc... made me feel stupid, then said "well, im happy that your responsible enough to know that speed and new drivers dont mix, take it easy for a while, get to know your limits,and never push them. Safe driving is good driving, remember that, on your way"

i was like.. chaching

He put it across in a way that made me think about it, which was good, deffo slowed me down, for about a week Good cop though