Duplicate filing for tax return

Hi, I am new to file my tax return. My wife and I have submitted our tax returns separately early this week (sent out six days already) using Track 24 via Royal Mail. However, I can only see my mail delivered to North West Midlands MC four days ago and without further delivery information. Since I understand the deadline of paper tax return will be end at 31 October this year, I would like to know if it is possible for us to re-send another copies of our tax returns to HMRC before 31 Oct. deadline as we would not like to file our tax return online.

Hi,
To check if your Self Assessment has been received we will need to access your record.
You can contact the Self Assessment team using the link below:
Self Assessment general enquries.
If not received, then yes you can submit again.
Thank you