Hi Coynie,
Welcome to the forum.
From what I remember about March, Cambridgeshire, Perth will be very different!
I don't know a lot about Perth since I've only been there to investigate it but I do know it gets hot in summer!
Have you already got the visas sorted out? If not check out the please read post towards the top of the forum that has links to the Australian governments immigration website.
Regards,
Karen