twentyfivetwelve

I have a WHV that needs to be stamped by early May. I am currently travelling around South America and will be heading to Oz late April/early May. I have changed my mind and would like to cancel my WHV and then re-apply again sometime next year..but I still need to travel through Oz to get back to the UK.

If I cancel my visa....am I eligible to re-apply again ? has anyone had any experience of doing this ?

thanks

p