Tier 2 to ILR questions

[RahulSS]

Hi Everyone,
Apologies if I am asking a question which is already answered.

I am completing 5 years in the UK in April 2019. Arrived in the UK in April 2014 on 3 years Tier2 General VISA which was extended in 2017 for 2 years and expires on April 2019.

My question is:
1) Should I apply for another extension of 1 year in Jan/Feb 2019 and then apply for ILR in April 2019? Is that advisable?
2) If I don't go for a year's extension, will applying for an ILR allow me to stay and work in the UK till the decision on ILR comes?
3) Does going for a premium service for an ILR application help?
4) If the ILR is refused, how soon I need to leave/depart UK? 60 days, 90 days?

Your help and knowledge are highly appreciated, thanks in advance.

[CR001]

1. Your choice if you want to apply for a 1 year extension if your sponsor is prepare to issue a CoS for 12 months.

2. Even if you do not apply for an extension, apply for ILR prior to your current visa expiry will allow you to stay and work as you are protected under section 3C of the immigration rules.

3. It means you get a same day decision although this is not guaranteed.

4. You will get 14 days to either apply for Administrative Review if you believe HO made and error or 14 days to submit a new application you think you qualify for. If your tier 2 has expired at the point of refusal, you should leave as soon as possible and HO will return your passport to you at the airport.