Here is a Giant Redwood (AKA as a Giant Sequoia) in a village near where. I often pass it and always stop to admire it.  I couldn't get a good angle to take the photo so a bit of another tree is visible at upper left but I hope you can see the Redwood is very impressive.

In their native range, the Sierra Nevada in California, the species is threatened: a combination of historical logging, suboptimal fire policies that led to build-up of combustible material causing the fires that finally occurred to be far more damaging; drought which made trees susceptible to bark beetles; and climate change has reduced the number of trees to around 80k.

However in Victorian times seeds were brought to Europe and in the UK particularly owners of large gardens grew them enthusiastically. And the trees liked it here and have thrived, so now there are about 5k notable specimens and about 500k younger redwood trees. A small minority are Coast Redwoods and Dawn Redwood but the bulk are Giant Redwoods. 

Of course most of these are young trees, as Redwoods go. The oldest is a mere 150 years old, compared with the 3,000 years some wild trees have reached. They grow fast here though; the tallest documented is 55 m, compared with around 95 m for wild trees, although the oldest wild specimens have a relatively greater volume.

But paradoxically Giant Redwoods may be commoner in the UK than they are in California (it's not an open and shut case though, because the 80k in California are large trees and we don't have a count of how many smaller trees have survived recent devastating fires and beetle attack). It's good that these magnificent trees have been able to grow so successful on another continent from the one where they evolved and let's hope some of the ones growing here today — perhaps the one picured — will live for 3,000 years.