Insurance question

[e21Mark]

Currently own 6 vehicles, 4 of which are classics, on limited mileage and agreed value policies. Obviously having six separate policies is expensive so I was wondering if there might be a multi car policy that could accommodate a mix of vehicles?

Cars are BMW 1600-2, BMW 2002, BMW E21 (modified), BMW E30 M3, Peugeot 106 & VW Transporter.

Any help/advice would be appreciated.