The design of this product has a lot of users and existing product (bike) interaction, therefore, it is a key part of this design process to acquiring measurements of both the female form and current bike frames and wheel sizes.
mm. in lock length required at location
FROm the above information you can see that on average a lock with at least 90mm will be sificicent for the most common location. I have been to all these llocation within the Warrington and AMcnhester are, so I cannot be 100% sure this is enough length for all trees and lampspost up and own the country.
However, that being said, in all my measurement I took the safest route possible going through the wheel, around the object (Tree, Lamp post, etc) and around the bike frame.