How do i get more information about columbia threadneedle investments? For more information about Columbia Threadneedle Investments or our products please contact your adviser or our Client Service Desk: If you are located outside of the UK, please call us on +44 1268 444 321.Where is threadneedle registered in the uk? Threadneedle Investment Services Limited, Cannon Place, 78 Cannon Street, London, EC4N 6AG. Registration Number 3701768. Authorised and Regulated in the UK by the Financial Conduct Authority.How do i link my existing investments to mythreadneedle? If you already have investments with us, you can link them to your myThreadneedle account. To do this, please contact our client service team on 0800 953 0134* (Monday to Friday, 8am-6pm) and we will provide you with a secure activation code.How do i contact mythreadneedle? Contact details. For more information and any queries about myThreadneedle, please contact us via the following methods: Phone: 0800 953 0134* Monday to Friday 8am to 6pm. Post: PO Box 10033, Chelmsford, Essex CM99 2AL. Email: [email protected]. *Calls maybe recorded.