Al-Khalili is an international treasure. Much preferred to some of the other "personalities" who do similar programs these days. I especially like how he works in real experiments. I'm trying to cover most of what is available by him and they are all very good. I am not a scientist and admit that they are challenging to watch and no way do I understand everything, but the things that interest Al-Khalili interest me.
I highly recommend any show that Jim Al-Khalili hosts. He, and the people he works with, are fantastic science communicators. They are very good at simplifying facts and ideas, without it feeling like you are being talked down to. These 2 shows in particular are very well done. It doesn't cut to other scientists reiterating what was just said, so flows nicely, and you feel you've learned so much when it's done.