What can I give new employer instead of p45

[TheBang]

I’ve taken on a second job.
New employer has asked for P45 but I don’t have one as I’m still working for old employer (both employers are aware of this).
What do I give them instead?

I think you just need to compete a ‘New Started Checklist’ on the HMRC website and give it to your new employer. P46s have been discontinued.

https://www.gov.uk/guidance/starter-checklist-for-paye

Thank you!