Am new here so greetings to all.

I have met my potential supervisor at Cambridge and he has now invited me to submit an application for PhD. But my MSc supervisor at QMUL says my MSc grades are not good enough for him to give me good reference for PhD. I have a good 2.1 in undergrad but during the MSc, I had to switch from full time to distance learning cos I was moving around the world for my job. Finished the MSc 3 yrs ago and have done great at work, giving speeches, publishing work, and doing loads of media interview. But am now scared that the MSc stuff could thwart my PhD dream. Please advise.