Nice points there Jagger. However, NATO is a defence allience not an offence one. If the Brits are the agressors, the USA would have to choose who tos side with.Obvcourse, this is so unlikely that it's hard to discuss.
As to the USN aircraft carriers, well, they are much more dangoures then the British ones, but remember that they are very similar in capabilties to the IAF. Never mind the US, as that is truely a complete war-winner(no one today can fight against the US for long and win.
Oh, Jagger, the gurrila thing you mentioned is intresting. Lets say that it's pure Israel Vs UK(No USA), and by some chance the Brits actually win(I just dont think they can take it....). Then what? Israels entire over 18(and some under) population has military training. Alot are armed. We have countless special tactics, explosives, electronic warfare experts that are on reserve.... Every high school student in Israel had some weapons training....This would be some gurrila.....