Fun for speculation though.
Why? At the time the most recent war scares the British had had was with the US over Venezuela, and with the French and Russians. The German-British rivalry really hadn't gotten going yet, and the British-American friendship hadn't either. At the time, the only real close ally the British had was Japan, and the British didn't actively support them in the Russo-Japanese War in 1905 (though they came close after the Russians idiotically shot up a bunch of British fishing trawlers thinking they were Japanese torpedo boats).
The British likely would have done absolutely nothing.
Excellent point. In any case, the "Great White Fleet" of American battleships would have put most of those German troop ships on the bottom of the Atlantic even if the Her Majesty's navy stood aside.
This episode was pretty well covered in the recent biography of TR, "Theodore Rex".
We wouldn't need the Royal Navy...The French would have stopped the Germans before they embarked......BWAHAHAHA!!
FMCDH