The phrase "a written authorisation" is correct and usable in written English.
It can be used when referring to a formal document that grants permission or approval in writing.
Example: "To proceed with the project, we need to obtain a written authorisation from the client."
Alternatives: "a written approval" or "a written consent".
Pieces of paper with written authorisation were an Iraqi obsession.
The act makes it illegal for a protest in a designated area of up to a 1km radius of parliament without seeking written authorisation from the police six days in advance.
On 31 July, Göring gave Heydrich written authorisation to prepare and submit a plan for a "total solution of the Jewish question" in all territories under German control and to co-ordinate the participation of all involved government organisations.
Ojha sent off for written authorisation from the government to keep Pillai off her flight, and a fax duly arrived.
You can make a complaint about a police officer's conduct towards you, or you can complain on someone else's behalf if you have their written authorisation.
Redundancy settlements distributed to staff include confidentiality clauses forbidding them from saying anything publicly about the newspaper's management or the closures without prior written authorisation.
Not take content down once it has been published unless by the prior written authorisation of the Managing Editor; and 2.1.3.
Her latest bill, which a Senate committee recommended against, would "provide Australian landholders the right to refuse the undertaking of gas and coalmining activities on their land without prior written authorisation, to ban hydraulic fracturing".
If GNM authorizes the Advertiser to use Data Collecting Technology, GNM will provide written authorisation within the Insertion Order and Advertiser agrees to use such Data Collecting Technology and all data collected from it solely in the manner disclosed to GNM. 19.
Earlier on 31 July 1941, Hermann Göring gave written authorisation to Heydrich to ensure the cooperation of administrative leaders of various government departments in the implementation of a Endlösung der Judenfrage (Final Solution to the Jewish question) in territories under German control.
