An unsuccessful defendant's denial of liability and cross-claiming against the successful defendant does not, without more, constitute conduct warranting a Sanderson or Bullock order, particularly where the denial was not unreasonable because the issues depended on contested expert opinion. A Calderbank offer that requires the offeree to accept the correctness of the offeror's expert evidence and assume conduct of the offeror's defence places the offeree in a position of conflict and is not a reasonable offer capable of supporting indemnity costs. Where the factual substratum for a Sanderson or Bullock order is not established, there is no alternative basis upon which to apportion the successful defendant's costs against the unsuccessful defendant merely because the unsuccessful defendant cross-claimed.
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