Submission of return

I think itr 1 would be sufficient

ITR 2 may be applicable

You are a resident as per IT Act and you have to pay tax on your global income in India. i.e. what ever amount you earned outside India that is UK salary also included in taxable income.

if you pay any tax in UK regarding UK salary you will get rebate of the same while paying taxes in India. that means you can reduce the tax to the extent of tax paid income of UK.

irrespective of the residential status individual who are earning only salary income can go with ITR 1.

Yes. itr1 is appropriate

Yes ITR 1 is applicable

If you are receiving global salary income, you have to file ITR-2 only.