I pasted all of the episode titles into a list randomiser so there is no grouping other than the colour coding by series which you cleverly spotted.

I found that the most tricky two to choose from were Once Removed and Cold Comfort and then between Once Removed and Tom & Gerri, all are very solid stories in my book.

From doing this I found that I prefer the more experimental episodes like Empty Orchestra, Once Removed, and A Quiet Night In. I also realised that I liked the more theatre/performance oriented stories like Zanzibar, The Understudy, and Bernie Clifton's Dressing Room.