Up to the first 5,000 words costs £15, then each multiple of 5,000 words costs another £15. So, if your manuscript is between 5,001 and 10,000 words, the cost is £30, and if it is between 10,001 and 15,000 words, the cost is £45. You can order in multiples of £15 (so £45 is 3x15 GBP).