The very slightest of gripes, and this is TV-wide, is that it would be nice, just once, to hear a proper Nottinghamshire/Derbyshire accent.
Don't get me started. From the stock yokel accents on Doc Martin to the Lancastrianized 'West Yorkshire' drawls of Last Tango in Halifax, so many otherwise excellent TV shows are spoiled by the clumsy portrayal of regional accents. If they can't get it right, I would rather they just stuck to standard English.