Transporing containers from the UK - Best companies to use, prices etc?

Hi

I am moving to Sydney with my wife in March, we are selling our flat and are looking to maximise the allowance on the flights and put aside some items to be shipped at a later date. It will only be another suitcase size I imagine, for personal effects and more clothes etc. Does anyone know the best way to do this, prices, companies etc.?

Thanks

Chris

http://www.sevenseasworldwide.com/shipping/movecube

I am not using them but they seem very reasonable for smaller consignments.

if its only 1 more suitcase then pay the airline the extra baggage charge