Lost locking wheel nut key!!?

Do you still have the box the the lock nuts were in. usually you swap the lock ones with the ordinary ones and keep them in the box. If so there should be a code and a contact number for the manufacturer. They can sell you a replacement key. If not you can buy a tool that removes them in Halfords. This may damage them but since you have no key...... You should sort it soon in case you have a puncture.