After speaking with a couple of GN who are planning a trip I found that quarantine information was not common knowledge, the link below will help.
For those of you who fish ensure that all your fishing gear is dry and clean, as these will come under scutiny. Vehicles should be free of mud and vegetable matter underneath.
Expect some delays at the inspection line once disembarked in Devonport. Sniffer dogs are used most days which are trained to pick up vegetable matter amongst other items.
When leaving the wharf there will be a guy/gal trying to give out a show bag, Take it as it is loaded full of information and coupons.
Thank you Bob. We got caught, had to hand heaps over, had no idea about quarantine restrictions and I'd stocked up on fruit/veg. Learned a big lesson that day about researching ahead!