Ok
Not sure yet about flight costs but Britannia used to do special flights which were cheap. Royal Brunei have always been cheaper but if you are planning this for later in the year ie the start of our next summer then watch out for start up specials from Emirates who have just announced new services to Perth.
I have a call in to a travel agent to see what a realistic figure is.
More background info from last weeks paper a furnished room in a suburb called Manning which isn't that far from the airport A$60.00-A$80.00 per week. or an unfurnished 3 bedroomed house in South Lake which is right next to the airport is only A$170.00 p/w so if a few of you get together you could negotiate a good deal for house and plane use. One thing though the unfunished house option is usually a six month let with about 8 weeks up front 4 of which are held as a bond. Some agents will however negotiate a shorter lease. there are plenty of second hand shops to pick up the essentials.
If you really want to keep costs down then get into barbequeing as many of the parks around Perth have free to use barbeques you just press a button and they get hot. Chuck a steak or some burgers on and away you go you would be amazed at the variety of food that can be barbequed.
However the best piece of advise is to get a big fridge lots of people over here even have seperate bar fridges, nothing better than a coldie after a long day or a short one for that matter. I must admit that the first thing that amazed me when I arrived in OZ was the fact that you can buy booze without even getting out of your car (drive through bottle shops). I don't know if you have got these yet in the UK.
Anyway enough for now If you want any more info just E-mail me and I'll try to help.