Updated: Form TM3A updated.
Do not use this form if the trade mark has already been registered.
Fee sheet
Fee payable forms must be accompanied with a completed fee sheet.
Cost
£50: Per class
https://www.gov.uk/government/publications/application-to-add-extra-classes
Content Reproduced verbatim from the Website of the United Kingdom Intellectual Property Office (UKIPO) as permitted under their Terms of Use.