A patient matched cutting guide which is arranged to guide a user to resect bone at predetermined positions during a surgical procedure., the guide including formations which engage bone parts to locate the guide such that other parts of the guide align with planned resection planes; characterised in that the cutting guide includes specifically placed, spatially orientated indicators which enable verification of resection locations intra-operatively based on measurements between at least one known reference on the cutting guide and the underlying bone to thereby allow verification of the planned resection planes.