Apart form the usual "Engineering" discussions, there's no obligation for an insurance company to accept a cert and cover you. A couple of associates have received letters from their insurers advising them that regardless of engineers certificates they were no longer covering lifts greater than 2" across the board.
So... IMO its wise to check your insurers policy FIRST, you could end up legal but still not insurable.
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It seemed like a good idea at the time........
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