13d Whitehall scientist makes contact with her. T?c?????a?.
21a Tiny transmitter in bottle with battery. ??r?e ?e?l. Something cell?
23a Singer Michael owns book about rare old motor. ?????? ??r. Something car?
15d Star's articulated vehicle, say, pulled up on purpose. Betelgeuse is all that fits (never heard of it) but messing about with eg reversed and bus , I still can't parse.
Thanks