The Brisbane Grand Prix this weekend has interval racing.
www.swimming.org.au/.../2014_GP_2_Program.pdf
3 x 200m Free will be swum on 3 minutes, enter using your 800m Time
3 x 300m Free will be swum on 4 minutes, enter using your 800m/1500m Free time
I'm curious to read the results and see how this turns out.