I've worked in Sheffield for a long time and yes you do get a lot of TW when you're new - but I would say it's the same in any big city. Certainly I wouldn't say there's more TW than say Leeds, Nottingham, Birmingham, Glasgow, Cardiff, most of London, etc.
If you want to try mixing it up a bit, you could try putting Rotherham as your location, or maybe Chesterfield? Depending which side of Sheffield you're working.