accurate not precise
Please refer to step 7 in your instructions for the importing cats/dogs to Australia, if you have not read this, it can be found here;
http://www.daff.gov.au/corporate_docs/publ...rog/infosh2.pdf The standard vaccinations must be up-to-date, and remain valid throughout transport and quarantine. If the booster is due in the period of transport/quarantine, then get it done (without the leptospira vaccine) approx 1 month pre flight - you are going to be at the vets anyway (blood test).
Remember no lepto shot, if your practice only has a pre-combined brand (there is one brand I can think of which cannot be given without lepto) - ask them to order in separated brands, or go elsewhere. They need DHPPi (or DAPPi) reconstituted with buffered solvent (used for the moggie jabs),saline or water for injections.
Ideally, if you have the time to do this, skip the lepto booster for at least 12 months, the recommended 6 months is not long enough.
If the lepto vaccine was given 6 months or less previous to blood tests, EXPECT to need 2 tests - so get the first test done at 30 days pre-flight or as soon as possible.
Kennel cough vaccination is prob best done previous to (or 1 week after) blood-testing, intra-nasal vaccinations can be erm... exhausting!
Booster intervals for KC are currently changing/disputed (some 6m, some 12m, some still only reckon 3months) and are different between the UK and Oz. All you need is cover for the quarantine, so I would advise go for within 6 months but no less than 2 weeks before travel - but ask your vet to check that the vaccine used will be valid for the period of quarantine. Also shipping agents may want this within a certain period, if your dog is going to be kennelled with them; check with them for details.
Good luck y'all.