I got the "England" map (which is a pretty neat, tight little map, to be fair!) smack in the middle of North America too. I wrote it off as an oddball experiment in urban planning and got on with killing aliens...
I had a Taaman blow itself up last night, which made me grin. Alien comes around the corner into the alley between two buildings, sees one of my soldiers and prepares to throw a plasma grenade at me... grenade hits the eve of one building, bounces back between the thing's feet and blows it up. Not so much "Alien Spotted" as "Alien Splattered"! Besides, the critter obviously didn't get the memo that plasma grenades are for me to salvage to use, not for silly aliens to throw!