text: Hello,
  This junction is called the "Whiddon Down Junction". It used to be called the Merrymeet Roundabout (from 1980's) but when the roundabout was removed in 2006 it was renamed the "Whiddon Down Junction" as there was already a "Merrymeet Junction" elsewhere in the region. It is still incorrectly, mistakenly or colloquially referred to as the "Merrymeet Junction" though. If you look at Googles Street View you can see the junction name on the road sign that is 0.5 miles before the junction and Sabre Roads also correctly refers to it.
  Thanks for the good work.