HMRC Admin 8 Response

Hi,
Yes that is correct if you meet the criteria for Self Assessment. 
Thank you.

Hi,
You can check if you need to advise HMRC of additional income at:
How did you receive your additional income?
Thank you

Hi,
As not a lump sum state pension if filing online you would enter the details in box State Pension - amount you were entitled to receive in the year, not the weekly or 4 weekly amount.
If filing on the paper form page TR3 box 8. 
Thank you.

Hi,
You can check on the expected date for reply at:
Check when you can expect a reply from HMRC
Thank you.

Hi,
Please refer to the previous answer given on this  forum here:
Claiming Marriage Allowance while living in The UK on Work Visa
Thank you

Hi,
Please see information here:
National Insurance credits Contents
Thank you

Hi,
For a more detailed answer to this question, you would need to contact our Self Assessment team below. 
Self Assessment: general enquiries
Thank you

Hi,  
You can find out when you can expect to receive a reply form HMRC here:  
Check when you can expect a reply from HMRC
Thank you

Hi,
Please see guidance notes here https:
Residential property finance costs in particular please refer to the section box 26.
Thank you

Hi,
Please see more information here:
https://www.gov.uk/pay-voluntary-class-3-national-insurance
Pay voluntary Class 3 National Insurance
Thank you.