The sum also includes £50,000 in tax-free compensation "for injury to his feelings" in December last year.

David Anderson left his role at Museum Wales in April this year.

Now, an audit report says there is "insufficient documentation" for the auditor to satisfy himself the settlement reached "complied with charity law".

The payments, according to the report, are expected to continue until September next year, totalling £325,698.

£225,698 of this is Mr Anderson's salary, including pension and national insurance, for the period between 17 November 2021 and 30 September 2024.

£30,000 maximum expenses for the period 1 April 2023 to 30 September 2024 are due to be paid.

On 30 September 2024, he is also due to be paid £20,000 as a termination payment for loss of office.

The report by the auditor general for Wales, Adrian Crompton, has been presented to Senedd members.

The auditor general is the external auditor for most public sector bodies in Wales, including councils, national parks and the Welsh government.

In light of the report, the Welsh Conservatives have called on the Welsh government to look into the situation to "ensure that due process was followed".

A spokesperson for the Welsh government said it was aware of the report but said it would not be appropriate for it to comment.

Seven museums form part of Museum Wales, including St Fagans National History Museum and the National Museum of Wales in Cardiff.

Other museums include the National Waterfront Museum in Swansea, Big Pit National Coal Museum in Torfaen, the National Slate Museum in Gwynedd, the National Wool Museum in Carmarthenshire and the National Roman Legion Museum in Newport.

A spokesperson for Museum Wales said the matters raised in the report are in relation to "unprecedented events" during "an extremely challenging period for the museum".

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They said Museum Wales would be "unable to comment on any matters involving any current or previous appointed representatives or members of staff" due to the confidentiality of related legal agreements.

The spokesperson added Museum Wales "has always acted under legal guidance" and worked with the Welsh government to consider "all available options in the best interests" of the organisation.

"A number of learnings have been taken from this difficult period", according to the spokesperson.

"Under the leadership of the new chair and chief executive, we are now looking to move forward and focus on delivering inspirational, inclusive and impactful museum experiences for the people of Wales," they added.

Sky News has asked Mr Anderson for his response.

In a statement issued in January announcing his departure, Mr Anderson said his 12 years in the role had been "the most rewarding of [his] professional career".