Please see below
Are any countries seeking opt-outs?
Ireland and the UK currently have an opt-out from European policies concerning asylum, visas and immigration. Under the new treaty they will have the right to opt in or out of any policies in the entire field of justice and home affairs.
Poland is also due to sign up to the guarantees on the Charter of Fundamental Rights negotiated by the UK.
Denmark will continue with its existing opt-out from justice and home affairs, but will gain the right under the new treaty to opt for the pick-and-choose system.
The Danish Prime Minister, Anders Fogh Rasmussen, has announced that a referendum will be held during the lifetime of the existing parliament on scrapping his country's opt-outs
http://news.bbc.co.uk/1/hi/world/europe/6901353.stm
http://news.bbc.co.uk/1/shared/bsp/hi/p ... treaty.pdf
http://news.bbc.co.uk/1/shared/bsp/hi/p ... reatya.pdf