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Paragraph 276ADE of the Rules provides for a person to be granted leave to remain on the grounds of private life on the basis of long residence in the UK.
Changes to this guidance – This page tells you what has changed since the previous version of this guidance.
Contact – This page tells you who to contact for help if your senior caseworker or line manager can’t answer you question.

http://www.ukba.homeoffice.gov.uk/sitec ... iew=Binary

I believe that you will be subject to the immigration rules in force at the time of the decision, unless there are transitional provisions or legitimate expectation to the contrary.

Thank you vinny