As I was listening to the accent of the speakers I kept thinking "I know this accent" and finally I figured out where I knew it from. Simon's favorite cartoon in London has been Fireman Sam, which as it turns out is a Welsh cartoon. I'm slowly getting better at identifying various British accents (including Australian, New Zealand and South African) and my trick is just knowing someone from each place and hearing their voice in my head.
We drove through central Cardiff but that bike race... It was late afternoon by then and we decided to begin our journey back to London. Just before crossing the Bristol Channel again we stopped at Tintern Abbey, which is the ruins of an old abbey built in another gorgeous valley.