You can apply NOW. That is as long as you were present in UK EXACTLY 3 years ago from the date that you apply. You do not need to have ILR for a year when applying as spouse of UK citizen http://www.ukba.homeoffice.gov.uk/britishcitizenship/eligibility/naturalisation/spouseorcivilpartnerofcitizen ...

Dear all, Can you please give advice on my situation? I have been in the UK for the last 11 years under legal stay (09/98-09/06 under student visas, 10/05-01/07 Science & engineering graduate scheme, 02/07-04/09 Spouse Visa, 07/09 - present ILR). I have been married to a UK citizen for the last 3 ...