15. A local authority is under no duty to carry out an assessment of the means of D—
(a)in respect of whom the following circumstances apply—
(i)a determination made by the authority in accordance with regulation 17 has effect,
(ii)D, who is the subject of the determination, requests that the authority carries out a means assessment in accordance with regulations 13 and 16,
(iii)the request relates to a service to which the determination relates, and
(iv)the authority reasonably considers that there has been no relevant change of circumstance since the determination was made; or
(b)who has been assessed as needing, or who is receiving a service or combination of services for which the local authority applies a flat-rate charge; or
(c)who fails to respond to an invitation to request a means assessment in accordance with regulation 8; or
(d)who withdraws his or her request for a means assessment in accordance with regulation 12.