Should my neighbour pay for half of the surveying fee to remark my property boundary?

This is addressed in the Neighbourhood Disputes Resolution Act 2011, and put simply is as follows—if the neighbour indicates that they know where the true boundary is and that, once surveyed, this position is confirmed as being correct, then they are not required to contribute towards the cost of the survey. If the position that they indicated was incorrect, then the surveying costs should be shared equally.