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I would not describe them as common at all. Even where they do overwinter, they are low in numbers. Unless you live in a warm coastal area or in an urban area where they happen to breed, they are quite a rarity. I have seen far more abroad than I have in this country; I always associate them with archaeological sites in the Mediterranean...the places I have seen the most.
My Flickr photos...
Put it this way; the BR I spotted some time ago not a million miles from my flat which I put on the BTO’s BirdTrack database has the location withheld by the BTO.
I was told by more experienced local birders that it was a common birds. We have sightings from Dover to Isle of Sheppey along the coast. But this male is a rarity with several females in my area. I only start learning about birds a few months ago. If you asked me, every birds is rarity to me to be honest. Thanks. (I use iSpot to learn)
I think it is how you interpret the word. Experienced local birders will doubtless see them quite frequently, but if they call them common, what would they call something like a Wren?!
Enjoy them, they are super birds and a rarity in many parts.
Lat/Lng: 51.3274, 1.4143
OS grid ref: TR379642