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Doug,
There will be no problem at all in pouring your fresh concrete onto day old concrete. Roughen up the top of the starter, make sure it's clean from dust and loose particles, and if you like, mix up a half litre of cement/water slurry to a creamy consistancy, and brush that on just before you pour the new concrete. Bondcrete can be used, but if you have some PVA glue, use that instead, it's much the same stuff. The steel starter bars will give you all the strength you need at the joint. Buy a 1.8m length of 12 mm Booker rod (Threaded rod) and cut it into 3 pieces for your starters. Alternatively, and this would be best, have your rods go from top to bottom of the pier and footing. Pour the footing, and then push the rods down into the wet concrete. As booker rod is sometimes greasy, clean it with metho, or petrol, soapy water etc, as oil is a release agent, and oily steel will not stick to concrete. I shall PM you with a sketch of what I suggest.
Regards,
Mike
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