The Nordmann fir is probably the most popular Christmas tree sold in the U.K. Good needle retention with soft shining green needles.
"The leaves are needle-like, flattened, 1.8-3.5 cm long and 2 mm wide by 0.5 mm thick, glossy dark green above, and with two blue-white bands of stomata below."
Often called the king of Christmas trees. Similar to the Nordmann but with smaller rich green foliage.
"The leaves are needle-like, 1-3.5 cm long, glaucous blue-green above and below with strong stomatal bands, and a blunt to notched tip. They are arranged spirally on the shoot, but twisted slightly s-shaped to be upcurved above the shoot."
Getting more and more popular every year, with good needle retention a very strong scent and often a quite slim tree with good shape if space is at a premium.
"The leaves are needle-like, arranged spirally on the twigs but twisted at the base to spread in two rows; they are 10–23 mm long and 2–2.2 mm broad, flat and flexible with a rounded or slightly notched tip, often with a small patch of stomata near the tip."