I simply must respond to my namesake

....amazing how time fly's....has it been 2 years already.
1. SET(M) lists other documentation pertaining to subsistance of a marriage not restricted to utility bills. Include NHS medical cards, payslips, DL and other official correspondence addressed to you while at your parents house.
2. Include a letter from your parents confirming the details you state with evidence of home ownership and utility bills in their names.
3. Your spouse if he has resided in the UK for 3 years at point of ILR grant may apply for naturalisation as a British Citizen. NI has a distinct police service - he is best to get a police clearance certificate to include in his naturalisation application in support of character requirement. This could take up to 40 days.
4. No harm in including pregnancy details - GP letter with confinement date should do.
5. Presume you are a resident of NI and have been for last 3 years. Your child taking into account amendments to the Citizenship Act (to replace Good Friday constitutional agreement) is eligible for dual British/ Irish nationality.
5. Your funds very o.k. - don't forget to submit mortgage docs though.
Congrats on the anniversary and on the pregnancy.
With best wishes - Kayalami