Colin Baker, who played a former incarnation of The Doctor, wrote on Twitter:
Oh my goodness. Kate O'Mara is no longer with us. Sad sad news. A delightful, committed and talented lady and actress. We are the poorer
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MPs have reacted to the news.
It comes after House Republican leaders postponed voting on a compromise immigration measure.
Which? said Amazon and eBay had removed the alarms that failed to sound in test conditions.