I thought I would share this useful piece of info I found out today.
I am flying to London via Hong Kong and my luggage allowance is 20kg plus 7kg carry-on
I am going to be living in London for two years after my Topdeck trip so thought I would take my winter gear with me to save me having to buy everything new over there.
My excess luggage through Cathay Pacific is USD60 per kilo.
I looked at going through an excess baggage company and the cheapest rates were about 300-400 NZD for a 10kg suitcase which would take 84 days by sea. and up to 800 if you wanted it there in 5-10 days (I looked at almost all the different companies)
If you send it through NZ post a 10kg box is going to cost me about $216 to send and will be there within 3 weeks.
I never thought posting it would be the cheapest option!!!
I hope this is useful for someone else too