Rupert was interviewed by Jenna Busch as the final episodes of Merlin were being broadcast in the United States. Among other things, Rupert said about the series finale:
I think we wouldn’t have done our job if people aren’t sad. I think people are going be satisfied. I think it could’ve gone on for another few series, but I think it’s good to end with people wanting more, so I think we end on a high.
Rupert wrote an article for the BBC’s TV Blog website during the lead-up to the fourth season finale of Merlin. He talks about how he was cast for Sir Leon, and how the character has grown since then. Among other things, Rupert said:
Sir Leon started off as a very small role. I was only meant to be in one scene jousting Arthur, but at the read-through I was given a couple more lines. I arrived on the first day of filming series two, having learned my line for that day – “The King commands your presence immediately” – and when it came to my first take I fluffed it.