She's listening...
Played by the beautiful Alexandra Bastedo, she had ultra-enhanced powers of hearing, just like my mother-in-law (aka "Bat Ears") in the 1960s TV show "The Champions"
This STEED lookalike (left) also had a role in this brilliant series, playing the mysterious Nepalese mystic who granted this bunch their hyper-sensitive powers after their plane crashed and wiped out his entire village in the mountains in this load of old cack. Well I made that last bit up, but apart from that it's very believable