Limitation for subrogared claims

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]A firm of solicitors were negligent in October 1998 and put their Insurers on notice in October 1998 . The case was struck out in September 2004 The Insurers made a claim in subrogation in 2006 . When does the date of limitatiion start for subrogated claims was it from the date of negligence in 1998 or from the date when the claim was struick out in 2004[/font]