The most Northerly point on the British mainland is Dunnet Head.
http://www.britannica.com/EBchecked/topic/173824/Dunnet-Head
Alaska is the most northernly state in the continental and all of the USA. Minnesota is the most northernly state in the contiguous USA.
Greenland has the northernmost point, Kaffeklubben Island, located at Latitude 83°40'N.
The most northerly point in the European Union is in Finland.
The Shetland Isles.
smithee,cambridge Norway
The most northernly city in Canada is Alert, located on the northern tip of Ellesmere Island in Nunavut. It is considered one of the northernmost permanently inhabited places in the world.
The most easterly point in Great Britain is Norwich, England. Norwich is on the south eastern side of the island.
Lizard Point
Ardnamurchan Point
Lizard Point...the most southerly place on mainland Britain. Also Mousehole in Cornwall.
From a military point of view, Britain is the closest ally to the United States. It is not powerful when compared to the United States itself, but when compared to most other allies Britain is powerful.
The most westerly town in mainland Brittain is Lands End.