We have been updated by the carrier and the outage was caused by maintenance work that wasn't relayed to us. Information attached for transparency.
We have carried out diagnostics for the date and time specified for reported circuit ID:LON/NEA/LE-689504 under Colt ticket#1-82234240171, including checking for historical alarms and performing a search of our databases to determine if any major network incident or Colt official planned maintenance affected the service reported, We found that service was impacted due to planned maintenance activity in colt. 1-82036406291."