Just saw this on the axminster site, wonder if it will be a good alternative to the frosts knives:
http://www.axminster.co.uk/product-Flexcut-Left-and-Right-Handed-Hook-Knives-792874.htm
Heath
http://www.axminster.co.uk/product-Flexcut-Left-and-Right-Handed-Hook-Knives-792874.htm
Heath