In theory you would have the same rights as a married couple, but the law is getting very tough on deporting people at the moment- and the courts have had no problems with deporting one partner (married or in a civil partnership) so best look into a lawyer too if you are having any doubts.
Read these pages for more information: http://news.bbc.co.uk/2/hi/uk_news/politics/4497348.stm http://www.adviceguide.org.uk/index/family_parent/family/civil_partnerships_and_living_together___legal_differences.htm http://www.ukvisas.gov.uk/en/howtoapply/infs/inf4husbandswifespartners
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"I am but too conscious of the fact that we are born in an age when only the dull are treated seriously, and I live in terror of not being misunderstood."
Oscar Wilde
