I required long term storage for my household goods before they were shipped to Australia and luckily this was not a problem, in fact it didn't cost us any extra.
Unfortunately we were unlucky enough to have a few damages when our goods arrived as well as some missing items. I emailed Insure-your-move.com and they responded immediately with exactly what I should do, it was an easy process and only took a few days for them to finalise my claim. The whole process took just under two weeks which I am very pleased with. My parents and my sister are immigrating to Australia so I will certainly be recommending they use Insure-your-move.com