1. I've originally offered ICT established staff visa on 2010 and I'm aware that, this is convertible in UK to tier 2 General, and I hope this is still in place.
Yes still applies.
2. Are they able to process my Tier 2 General visa whilst i'm working for current employer?
Yes, if they are a licensed genuine sponsor.
3.At what point I need to tell my current employer that I'm reassigning from them?
Usually once your tier 2 general visa has been granted.
https://www.gov.uk/guidance/coronavirus ... -residents
If you’re applying to stay in the UK long-term
You can apply from the UK to switch to a long-term UK visa until 31 July 2020 if your leave expires between 24 January 2020 and 31 July 2020. This includes applications where you would usually need to apply for a visa from your home country.
You can also apply from the UK if your leave expires after 31 July 2020 but you urgently need to make a new application, for example to start a new job or course of study, and cannot leave the UK to make an application from overseas. This includes applications to switch into a different work route or to change jobs in the same route using a new Certificate of Sponsorship (CoS).
You’ll need to meet the requirements of the route you’re applying for and pay the UK application fee.
This includes those whose leave has already been extended to 31 July 2020.
You can apply online. The terms of your leave will remain the same until your application is decided.
The below however, might only apply to those who are changing tier 2 general employers and not tier 2 ict to tier 2 general because your existing Tier 2 ICT visa conditions continue while HO is processing your application, which means you can only work for your ICT sponsor.
If you’ve applied for a Tier 2 or 5 visa and are waiting for a decision on your application
You can start work before your visa application has been decided if:
you’ve been assigned a Certificate of Sponsorship (CoS)
you submitted your application before your current visa expired and you show your sponsor evidence of this
the job you start is the same as the one listed on your CoS
If your application is eventually rejected as invalid or refused your sponsor will stop sponsoring you and you must stop working for them.
4. What is earliest i can work for new employer (this is immediate start and can wait for 30 days for my notice to current employer - due to urgency only they are looking to sponsor) ?
Likely once you have visa approval.
5. If COS for Tier 2 General submitted with home office with start work date as 15 Aug, can I start that day with them even-though visa decision is pending with them?
See above. While you have an application pending, your existing Tier 2 ICT visa conditions continue.
6. Or, I need to get Tier 2 G in hand to start work for new employer, in this forum I read somewhere due to covid, UKVI is allowing to start work for new employer back of COS, is that my understanding correct?
Usually you need tier 2 General visa BRP first. The working when CoS assigned is likely for Tier 2 General migrants changing employers on Tier 2 General or Tier 4 to Tier 2 General or PBS Dependent to Tier 2 General.
6. What are paper work I need from new employer before reassigning with out affecting my visa status, please?
You need a CoS and all the requirements must have been met, specifically RLMT for 28 days if relevant and a non shortage occupation. You haven't stated what your SOC is.
ILR Priority service will help me high time to join to them with any of this but they are kindly agreed to try this option for me which I haven't tried for last 10 years
Unclear why you want to do this long winded and costly route instead of simply applying for ILR. You could have applied for ILR weeks ago already, which you knew as you have been asking these questions since September last year.
The same delays will apply to Tier 2 General and priority is still suspended.
