It seems that the majority opinion of posters is that we don't need standard common names for both sides of the pond - that's what the scientific names are for. Actually I suspect that some species' North American and European scientific names aren't always the same either, as presumably the bodies that decide these things do not always make the same taxonomic choice. However, I realize that, while I've certainly birded in Europe, I know nothing about who decides the common names and taxonomy over there. I assume that there's an equivalent to the American Ornithologists' Union (AOU), but could someone tell me who it is?
I admit that I thought more people would say "change our British names over my dead body!", or words to that effect - nice to see that people are prepared to be conciliatory! I was pretty surprised that the one bird name mentioned that people were upset about was that of a vulture. Ironically this seems to have come about not through the desire to standardize the name of the same species but to differentiate between two species. Can't see why we couldn't keep Black Vulture for both and just add a geographical modifier.
Kevin Mac mentioned the dullness of the name Grey (or Gray) Jay. Although this name wasn't chosen because of Old World considerations (to my knowledge Perisoreus canadensis doesn't occur outside the Western hemisphere), it highlights what I perceive as a general "problem" - the propensity to choose boring morphological descriptors for bird names. I'm trying to learn the neotropical birds and wish there were more interesting names. And when a quaint name is a possibility it seems to be suppressed, e.g. Brownish Twistwing (coined by Robert Ridgely?) became boring old Brownish Flycatcher on the AOU list. Boooh! A topic for another thread, no doubt.
Returning to the subject at hand, part of me wants standard names internationally because having multiple names is "messy". Some have suggested multiple names is an advantage as it can get you a longer list. And here I was thinking that this was a disadvantage! Oh the pain of having to remove one of Snowy or Kentish Plover from your list because, after many years, you've discovered they're the same bird. Another more iconoclastic part of me likes the fact that there's variation in the names - makes things more interesting, colourful.
A number of people mentioned that there weren't many species involved. But how many are there? Using the very latest North American list (7th edition AOU checklist with 45th supplement) on the one hand, and an ancient copy of Bruun and Singer's Birds of Europe (bought in late 70's(?) for $6.95 hardcover) I came up with the following. No doubt the European info is a little out of date! If you spot errors, please let me know. (Have not bothered listing names where the only difference is the North American version uses the modifiers Common, Eurasian or European)
Brant/Brent Goose
Tundra Swan/Bewick’s Swan
Green-winged Teal/Teal
Greater Scaup/Scaup
White-winged Scoter/Velvet Scoter
Black Scoter/Common Scoter
Common Merganser/Goosander
Gray Partridge/Partridge
Willow Ptarmigan/Willow Grouse
Rock Ptarmigan/Ptarmigan
Red-throated Loon/Red-throated Diver
Arctic Loon/Black-throated Diver
Common Loon/Great Northern Diver
Yellow-billed Loon/White-billed Diver
Horned Grebe/Slavonian Grebe
Northern Fulmar/Fulmar
Northern Gannet/Gannet
Great Cormorant/Cormorant
Great Egret/Great White Heron
Black-crowned Night-Heron/Night Heron
Northern Harrier/Hen Harrier
Northern Goshawk/Goshawk
Northern Lapwing/Lapwing
Black-bellied Plover/Grey Plover
Snowy Plover/Kentish Plover
Ruddy Turnstone/Turnstone
Red Knot/Knot
Red Phalarope/Grey Phalarope
Pomarine Jaeger/Pomarine Skua
Parasitic Skua/Arctic Skua
Long-tailed Jaeger/Long-tailed Skua
Mew Gull/Common Gull
Black-legged Kittiwake/Kittiwake
White-winged Tern/White-winged Black Tern
Dovekie/Little Auk
Common Murre/Guillemot
Thick-billed Murre/Brünnich’s Guillemot
Atlantic Puffin/Puffin
Rock Pigeon/Rock Dove
Boreal Owl/Tengmalm’s Owl
Northern Shrike/Great Grey Shrike
Horned Lark/Shore Lark
Bank Swallow/Sand Martin
Barn Swallow/Swallow
Gray-Headed Chickadee/Siberian Tit
Winter Wren/Wren
Northern Wheatear/Wheatear
Lapland Longspur/Lapland Bunting
Red Crossbill/Crossbill
White-winged Crossbill/Two-barred Crossbill
Hoary Redpoll/Arctic Redpoll