https://www.gov.uk/government/news/collision-near-thetford
Not a tree, but this 170 (which the ScotRail HSTs partially replaced) was involved in a collision with a tractor. Pretty extensive damage but the cab side pillars remained intact.
Last saw them in a possession train in August last year, definitely not the remaining ones' usual traffic though.
29/8/21
About 9 in this train behind the Coalfish returning to Millerhill from Inverurie. They had been loaded with steel sleepers to the worksite.