- Some 22,453 motorists 70+ had licences revoked in 2018 - up from 9,265 in 2010
- Number of licences taken away for medical reasons has grown across all ages
- For all ages, revoked licences increased 117% in the comparison over eight years
- Road safety groups say more needs to be done to take unsafe drivers off the road
- The issue became headline news following Prince Philip's crash outside the Queen's private home in Sandringham
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