Scotland

Tim Johnson contribution of his parents giant sequoia in Scotland measures 656 cm to 668 cm at 1.5 m from solid ground
From Tim Bekaert collection. A very remarkable feature called Avenue of Giant Redwoods in Argyll area Benmore Gardens. Of the 50 planted trees, the weakest one did not survive the heavy weather of 1968, so this avenue now consists of 49 145 year old giant redwoods that are about 50 m. 
Kenilworth Castle Tree , City of Gloucestershire. Giant sequoias were first brought into cultivation in 1853 by Scotsman John D. Matthew, who collected a small quantity in the Calaveras Grove, arriving with it in Scotland in August 1853 (Mitchell 1996).