Here is how Lange describe the boot:
The Lange Comp Ski Boot series remains Lange’s definitive boot for expert freeskiers. It has a friendlier ride for most applications and has a sleeker design than the World Cup Series. Demanding experts will love the quickness and agility of the Comp 100. The medium volume boot fit is a more generous fit in sensitive areas of the foot. A softer (but still stiff) flex than the Comp 120 makes the Comp 100 a great boot for lighter-weight experts as well as cruisers.
These are a UK size 10 and are 324mm in length (for ski bindings not feet size).
Feel free to contact me if you have ay questions.
Happy to arrange collection from CM21 9AG, or I will post them to you.