10. Random Casualty Filming
Anyone who travels around Cardiff enough will be familiar with the sight of blue production vans signalling that Casualty (which formerly called Bristol home) is filming somewhere nearby. Where they're actually shooting tends to be a mystery until you spot a street you recognise on a rare Saturday night in. However, when they start blowing s*** up in the early hours as they recently did much to the chagrin of Cardiff Bay residents, then you'll know!