If you are in UK, you can probably apply for registration using MN1.
No financial requirement.

Just your ILR copy, UK birth certificate for your son and your marriage certificate are needed.

Will this be a problem during re-entry into the UK?
No. You will be fine, as long as the passport/visa is valid on the day you enter the UK

11P section for Tier 2 migrant.

Read the above comments.

For PBS dependent too, access the Tier-1 option and proceed.

This is what confused me initially, please see below No confusuon here. You need to prove the following a) The degree you hold is equivalent to UK bachelor degree b) The degree is taught/researched in english. Now, to prove the above two points, you may need to access the PBS calculator as Tier-1 mi...

You don't need the NARIC letter. If the degree is recognized in PBS calculator that is more than enough and if you have letter from university that's a bonus as well.
I second that. I did use PBS printout and degree certificate and it was accepted.

Yes. I did used my degree and PBS calculator printout. (used Tier-1 General option for PBS printout, eventhough I was applying under Tier-2).
All went fine.

P60's are not mandatory document.

No. It wont.

Given the complexities involved, I would advice you to better take a english test to clear the lanuage requirement rather than risk your application.
It is pretty easy and straight-forward.

You mean the degree got her surname? If yes, then i dont see any issues here (her passport must have her surname as well).

Cohabitation covering two years is needed. Although there is no hard&fast rules, you are expected to submit documents from atleast three different sources covering the whole 2 years, atleast one for every 3 to 4 months. Anyletter on your wife's name would count (like even Tesco clubcard, GP/hosp...

04/10/2010 minus 28 days.
Any time on or after Monday, 07 September 2015 (06th is a Sunday)

Such IT glitches are not rare and heppened numerous times before.

You have absolutely no reason to worry, if you had any problems in the past which was not disclosed in your application.
Relax.

As per the MN1 guide, the name appearing on the resitration certificate will only be amended in most exceptional circumstances. Unfortunately, your case is pretty uncommon, and so it is not possible to definitely tell the time frame. Provided, you send them the child birth certificate with your appl...

Yes. Refer the PBS dependent policy guidance from the link below, (See Introduction --> Point 2 ) https://www.gov.uk/government/uploads/system/uploads/attachment_data/file/324611/DEP_guidance_07-14.pdf Your wife can apply to extend her PBS dependent visa, even you are now in ILR (provided, you held ...

For your kids MN1 application you dont need bank statements etc. Only the following documents will suffice 1) Kids original birth certificate 2) Kids original passport / or any BRP if they it. 3) Your ILR BRP photocopy (not original) 4) Your marriage certificate For MN1 application, you can possibly...

Marriage certificate is neither mandatory nor sufficient document to prove cohabitation. But, if you have it, no harm in submitting it. But, you may need documents for cohabitation proof. Three application? You mean your two kids MN1 registration + wife's SET O form? You cannot send them together as...

1. What is this Police registration certificate highlighted in the checklist? Is this the same with CRB? No. CRB is different. The police registration is required for certain nationals, which are endorsed on their visa. If you did not see any endorsement in your Tier-2 BRP then you don't need this. ...

Q1. Which form to use for wife for ILR? since mine already approved so her application will be separate, form set O only has option for Main applicant+dependant. Set O for your wife. She needs to fill that as the main applicant. LIUK + english language and cohabitation docs needed. All other section...

Only absences from UK need mentioning in the letter.
If you take holidays and been inside UK, no need for this to be listed in your employer absence letter.

There are days during which the PEO will function until 8pm. I think, you might have found a 5pm appointment in any of these days. I do beleive, there is enough time to get your application processed and obtain a decision on your application (the PEO route is recommended for straight-forward applica...

One form for you+any dependents applying at the same time.

That should be ok I think.

Your best bet is 1) First book the earliest available slot and make sure you have a booked test in April. 2) Keep looking the LIUK websiet for cancellations (as frequent as you can) The cancellations do come occasionally, which you need to grab immediately. If you are lucky and got a slot, then comp...