Self assessment tax refund

Hi, I filled in my self assessment tax return on 31st January and it's been filed and I'm owed a refund. It says pending on the refund page The "when will I get a reply from HMRC page" has gone past the 31st January on the dates that they are up to on claims but I've not heard anything How long before I can expect a refund to my bank account? Thank you

Hi,

Some of our repayments are selected for additional security checks, and where possible we aim to complete these within 6 weeks.

If further information is required you will receive a letter.

Thank you.