Hi Sachin,
see the following post for the answer to your queries ,,,
https://coderanch.com/t/32555/Jobs/careers/Whether-go-US-or-UK about the falling dollar rates,,
just saw in today london news papers that since Bank of England is cutting interest rates,, the dollar will rise against the pound ,, and within the next 15 months it will be around 1.76 dollars per pound. Last October it was 2.1 dollars per pound.
anyway, this is not a big issue,, and what i can say is that the UK job market is good, and better rewards in the finance and insurance domains.