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However, one Dutch investment bank, Nsinger de Beaufort, is going back to basics.

Its new monthly service involves couriering a brown shoebox to too-busy, wealthy clients for them to pop in all finance-related admin. Bills, statements, receipts, tax returns, insurance documents, even unpaid speeding tickets, will all be processed by the bank's personnel within three working days and an overview of actions and transaction sent to the client.

But why stop there? Surely their clients have bins that need empting, cigars to be clipped, and "handbag dogs" to be potty trained too.