@Just Some Guy,
Yes it is Ok if is that what you wish.
We are masters of our body and it does not matters what other people may think.
If someone sees your hairless legs and you do not want to give explanations don´t do it. If you feel like it, just say the truth, ofr invent something silly. Is your body after all.
You can say you are practice semiprofessional swiming or whatever you like,
I imagine UK as rainy and foggy must of the year. So long pants are needed. So try if you feel like it.
If you have any personal or cultural or familial reasons to do it be free to be more specific.