Automate assigning contacts to user based on country

Hi all,

I’m hoping you can help me with this.

I want anyone that comes into our database with UK or Ireland as their billing country, to be automatically assigned to our UK regional manager.

I have a large, looping campaign that brings in leads from various countries via a dropdown form or product order form, but just want the UK and Irish leads to be automatically assigned. I don’t see how I can add the reassign action without disrupting leads from other countries or the sequence that they are all traveling through.