<prompt> Translate the following text to EnglishIkiwa sisi kudhani kwamba sehemu zote gharama mbali na utoaji barabarani kutofautiana na kiasi, thamani ya kiwango ni kuhusu 17 ya gharama ya jumla katika Uingereza kiasi na ngazi ya chanjo.  <response>: If we assume that all cost segments other than street delivery vary with volume, the value of scale is about 17 percent of the total cost at the United Kingdoms volume and coverage levels. 