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To remove dual authority you will need to write a letter signed in line with your existing bank account arrangements and email it to bascomms@co-operativebank.co.uk or post it to the address below:
The Co-operative Bank
Business Customer Services
PO Box 4931
Interface Business Park
SWINDON
SN4 4PL
To add dual authority, call the Business Account Support team on 0345 7213 213. Lines are open Monday to Friday 8am to 6pm, Saturday 9am to 12 noon. Call charges apply.