Aldi in the UK currently have citrus trees and they're quite cheap, about 1/3 of the price they'd be anywhere else. I bought a lemon tree, I was tempted to get a Calamondin, Chinotto and Kumquat as well, but decided against it.
The citrus trees actually look very healthy and they're quite large and most already had fruit and blossom on. They're some of the best looking citrus plants I've seen in shops here.

Anyway, the tag gives no indication as to what variety of Lemon it is. I first thought it'd just be Eureka, but I saw an orange coloured lemon by the trees, does that mean they're Meyer?

Lunario

Those don't look like Meyers, based on the prominent neck and nipple. I would agree with Esmark in saying an Italian lemon.