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The Srinder Singh principle under EU law should apply in this case. Under EU law, the 2 years relationship rule does not exist but the Home Office sometimes tries its luck in referring to this with EU applications and it shouldnt. However, under EU law, your marriage must not be seen as a marriage of convenience. It is unlikely your would be as you both have a child on its way and you have lived together for 10 months. The 2 year rule only exists under British immigration laws. I would suggest applying for an EEA family permit for your wife under the Surinder Singh principle. There is always the better option to get married if that is what you want.
Well if you prefer you should seek legal advice as experts on JA do not give legal advice. I have given you the available option you should follow. If you have been in a genuine relationship as you say you have and you have the evidence of your relationship and you are expecting a child from your relationship and you both decide to get married, how can that be interpreted as a marriage of convenience. If your partner is granted an EEA family status she will be entitled to use the NHS. EEA applications and options are simple and straightforward and are inheritably easier to obtain.
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