Been given a Lemon Tree, grown from a Pip, it is about the length of a Ladies Arm. There are no Side Shoots. I obviously know nothing about Lemon Trees, should it have been nipped out before this, or just left to grow.
I just looked it up on google and found a Gardeners’ World video from Monty Don.
Take a look at it, and then decide. As you live in less balmy climes than GGTardis, you might adapt accordingly …. but don’t cut it off yet … listen to Monty first Good luck