I rang Slingshot to check this and they basically gave me the "tough..its too hard to sort" response. Upshot I left and went to orcon.
Unfortunately not only is Orcan sloooooow at times but I lost the best feature that Slingshot had - free off peak downloads(it does not come off the data allowance).
I have decided that staying with orcon is not really worthwhile and wonder if there is another ISP who offers free offpeak data and if so what they are like on the other fronts?
I know I could (should) ferret this out myself but figured it is easier to ask here- although given this is an Orcon sub forum there may not be anyone with the necessary knowledge reading this.