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My 'Interpretation' is your not doing anything wrong as you are a skirmisher. Under 18 or not. The Onus is on the retailer/seller to make sure at point of sale they are supplying a RIF for the intended purpose (such as Airsoft, reenactment etc) Now it has been gifted to you it is your property to paint all you want!
But like I say that is my interpretation. The law is open to interpretation and abused because of this by criminals, police, judges and politicians and the rich alike!!
Just remember to act sensibly and package it well whilst in transit. A suitable gun bag/case or in its original box which has been covered will be fine and IF (big if) stopped be honest straight away about what you have and what it does, ie its a toy that shoots plastic bb's. dont scare a poor copper/steward/ticket inspector