Hello and welcome to the forum!

1st question: I think you'll be alright on bringing the noodles. If you ran out of it then just run into a nearest chinese shop!

2nd question: Tower of London is nice when its not raining, westminster abbey isnt an abbey for me, it looks like a graveyard but not bad, nice altar where Prince Willian and Kate exchanged vows. St pauls cathedral is fab specially if you going to climb the dome, buck palace- book ticket online if you can cos they do run out of tickets in their booths there, big ben is free, london eye got long queues but worth the wait as you see the whole of london and the famous river thames, London dungeon and madame tussauds good for rainy days as it is an indoor activity.

3rd question: weather in august last year was good but I cant tell if its as good as this year. Lets see!

Ill be in London on October so if youre around just give a shout! Have a nice visit to the UK!