https://www.slab.org.uk/faqs/new-branch-within-a-firm/
If your firm opens a new branch and intends to submit applications and/or accounts from the branch then its details will need to be added to FAMS. The branch details can be entered onto FAMS by phoning or writing to our Receipts and Payments Department. You need to tell us basic details including:
We will then:
You should return the signed registration form with a copy of the senior partner’s practising certificate and, if appropriate, a copy of the VAT registration form. We will then write to you when we have activated the code.