If you are watching this purely for the science, you may well be disappointed. You will most likely learn nothing you didn't know already. BUT. If you watch it for the history and the enlivening of science fact with context, place and time, you will be delighted! Notable scenes were set in Watson & Crick's office, the pub where they celebrated discovering the structure of DNA, the secret installation in Wales where wartime research on enriching Uranium was carried out, the Royal Institution Lecture Theatre and the Hunter House Museum.
I was captivated particularly by the gruesome details about John Hunter's anatomical research (and the grave-robbing that allowed it) and the "resurrection" of George Forster by Giovanni Aldini. This was an example of the running theme in this first episode - the morality of science - drawing in animal experimentation, GM crops and CND among others. And while Brian was careful not to take sides, it was not too difficult to read his pro-science onion between the lines with regard to most issues.
I am looking forward to the rest of the series.
Well worth looking up on the iPlayer (or searching for an "alternative" viewing method (coughtorrentcough)) if you missed it.

Link to the series home-page on the BBC site.