Returning to the UK. How to notify HMRC

2 years ago I left the UK and moved to Costa Rica. I continued to work for a UK company and was paid in my UK bank account. I filled out a P85 at the time I left and HMRC adjusted my tax code accordingly. Following the SRT I was deemed non resident for the time I was going to be out of the country. I am still on UK paye working for the same company and plan to return to the UK in October and need to notify HMRC so they can readjust my tax code back to what it was. However, on the site it does not say exactly how. DO I just fill out a P85 gain?

Can anyone help with this? I have tried to get through to an HMRC engineer but its been impossible.

Hi devtoka,
You can contact our webchat facility at:
Self Assessment: detailed information
To advise them when you return to the UK, or you can phone the Self Assessment helpline (after 4 September 2023) on 0300 200 3310.
 My colleagues can then advise if a tax return is required and can ensure that a revised tax code is issued to your employer.
Thank you.