The Taipei Representative Office in the UK (Taiwan), as of 30th April 2015, require the owner of the document, whether private or commercial, to issue a separate letter of authorisation to the Agent to legalise the document on their behalf. The letter must include the expiration period and has to be notarised and submitted with the document for legalisation - copy is accepted. A new application form has been created and must be used also. I can deal with all of this for you.