Here is verbatim an email from BullionVault:

 Why do people store gold offshore?
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Opinion on gold storage is extremely polarised.  Almost exactly half
of the world’s gold buyers strongly prefer to store gold at home,
because they trust domestic property rights, while the other half
strongly prefer to store it abroad.  Surprisingly this ratio is
consistent regardless of which country people live in.

This is why - uniquely among retail gold providers - BullionVault
provides a storage option in three separate jurisdictions: Britain,
Switzerland and the USA.  This gives European and American buyers
a domestic storage option and everyone a choice of at least two
foreign storage locations.

On BullionVault you can switch between vaults in a few seconds,
by selling in one and buying in another [you can only do this
where settlement is instantaneous, as it is on BullionVault].
And because all our vaults are operated by Via Mat you can also
arrange for shipments of whole bars direct from vault to vault.

These are some of the ways in which BullionVault has been set up
to give you the storage flexibility you need to stay secure.

At BullionVault we believe increasing economic imbalances pose a
significant threat to personal wealth.  It is for you to judge the
threats to your wealth, the alternate strategies, and the potential
benefits of gold, and to decide for yourself what to do.  If you make
the decision to buy gold we are here to provide exceptional value for
both your purchase and your ongoing secure storage, and to see that
it is you who benefits if your decision to own gold is a good one.

Please feel free to tell us about other gold services you think
could improve our service.  Just drop us an email…

Regards,
Paul Tustain, Director
[1] www.BullionVault.com

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Useful links
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I want to buy gold:
    Log in here: [2] https://www.BullionVault.com/secure/login.do
    and click ACCOUNT->DEPOSIT

I want to look at real-time gold charts:
    Go here: [3] http://www.bullionvault.com/chart.html

I want to look at live bullion quotes:
    Go here: [4] http://www.BullionVault.com/ and click MARKETS->ORDER BOARD

I want more information:
    Go here: [5] http://www.bullionvault.com/help/FAQs/FAQs_whyBV.html