I say GO FOR IT, what an awesome opportunity, if you don't go , you will probably end up regretting it.

There will obviously be things you dislike about being in a different country, but at least you are going somewhere where they speak English, even the Queen's English.

How long would you be stationed in London?

I Think taking the kitties would not be a problem, remember Jenluckenbach sent Annie from the USA to Britain, but then she is not having to come back home, so you would need to check that out properly.

I say GOOD LUCK on an awesome adventure ahead of you.