A word of warning...... Offshore banking centres are not safe!
The IOM has a £50k guarantee with no way of funding it as is now being proven with the Kaupthing collapse.
The channel islands have no scheme at all unless you are resident.
Thousands os savers have lost all their money over the last 6 months thanks to these offshore centres.
Tax is taken at source anyway so what are the advantages? Just bank onshore.