Hello Down_Under,
I live in Queensland south of Brisbane and earlier this year I followed up the issue of importing plywood laser cut baseboards from Tim Horn into Oz from the U.K. with the Department of Agriculture and Water Resources and it is my understanding, following the links and advice given in their response, that both plywood and MDF are permitted to be imported into the country under the description of a “Wooden Product”.
There is a responsibility for the Manufacturer and/or Supplier to provide details of the product and source materials and the importer to provide this information to the department for review and appropriate authorisation.
Link to BICON (Biosecurity Import Conditions) database: https://bicon.agriculture.gov.au/BiconWeb4.0/
I haven’t approached Tim yet with this information due to website updates. His old website stated the only country he could not expert to is Australia. I don’t think that is now the correct, although some additional documentation may be necessary to be able to export to Oz.
I would be interested to know how you get on if you are already in communication with Tim.
Roger