ILR application for Dependent

[ukimmigrant]

Hello,

I am on Tier 1 and I am going for 2 yr extension from July 2013 to July 2015. In 2015, I shall be eligible to apply for ILR.

My wife is pregnant and wish to deliver the baby in India. As known to me, it is not possible to apply for extension of VISA from India. There might be a 1 month delay for me to get the extension and for her to apply and get the new VISA.

So would it be a problem if there is a break in the VISA for my wife when I apply for my ILR? As per the rule the dependent should be staying with the main applicant in UK for at least 2 years while applying for PR.

1. How do the UKBA officers check the continuity of 2 years for the dependants?
2. Is the absence rule (180 days rule) applicable for our dependents as well?
3. Will Utility Bills be sufficient for proving 2 yrs residency for dependants?

Looking forward for your replies..