Ah! Did you buy this through their PCW Business section because if so, it's completely different to buying as a consumer. Even now £13.21 is an odd amount so I would like to know what this "Policy" entails and what it cover. How old is this Laptop and exactly which model?
This could be a Business type insurance cover which would replace your laptop should it fail. In which case we don't want to stop paying it now! After all £13 a month is roughly £150 a year. If it's over 4 years old it's paid for itself from the insurers point of view. Post back with some more info please.