Looks like anyone who can prove they tried to submit a callback request to the Pension helpline before the 5 April 2025 deadline, will be allowed to proceed with the top-up process.
From BBC News website
Gist of the article here:
"Although this April's deadline still stands, there will now be some leeway for anyone who struggles to get through on the phone.
Anyone who is unable to make contact with the DWP ahead of the deadline can use an online call-back request form.
People who submit a call-back request by the 5 April deadline will still be able to pay voluntary National Insurance Contributions back to April 2006, after the deadline has passed.
Anyone in this position should save a screenshot of their call-back confirmation message. A return call should come within eight weeks."
From BBC News website
Gist of the article here:
"Although this April's deadline still stands, there will now be some leeway for anyone who struggles to get through on the phone.
Anyone who is unable to make contact with the DWP ahead of the deadline can use an online call-back request form.
People who submit a call-back request by the 5 April deadline will still be able to pay voluntary National Insurance Contributions back to April 2006, after the deadline has passed.
Anyone in this position should save a screenshot of their call-back confirmation message. A return call should come within eight weeks."