They grow big in Pembrokeshire
 

Just back from 10 days or so in sunny North Pembrokeshire.
Whist out and about I came across lots of wild foxgloves, some
towering above me. One in particular in a shady path alongside
the river I estimated to be about 8ft tall (2.5 meters in new
money!)

Then I found 2 clumps of Gunnera (Giant Rhubarb) which were
both about 12 ft (3.5m) tall and around 20 ft across!

--
Roger T

700 ft up in Mid-Wales.