There is no problem importing wood kits from England as long as there is no bark or insects. (if there was insects or bark they wouldn't be much good anyway)
Looking at the AQIS website
http://www.aqis.gov.au I came up with this when searching for "Wooden articles - Manufactured" from the UK.
Quote:
Condition C8932
Non-Commercial
1. An Import Permit is not required.
2. A Quarantine Entry is not required.
3. Each consignment will be subject to an inspection to verify that it is free of live insects, bark and other quarantine risk material.
4. If the consignment does not meet the above conditions it will require treatment as detailed in the Commercial conditions below, re-exported or destroyed.
