“de-activated firearm” means an imitation firearm that consists in something which was a firearm but has been so rendered incapable of discharging a shot, bullet or other missile as no longer to be a firearm.
I have no problem in handing the case to the flight crew and getting it back upon arrival but I am not willing to ship it as an extra bag and risk losing it.
Is it possible for the security to stop me from having it on board even that it's allowed on the aircraft?
All firearms (including replica and decommissioned) and ammunition are restricted under UK law and may be carried only with advanced notification and with the appropriate licences and documentation.
Each case containing firearms or ammunition is subject to a £50 charge at check-in each way to cover the cost of our specialist firearms and ammunition handling partner.
All passengers intending to travel with firearms or ammunition must ensure they have the required documentation and licences for them. This includes export/import licences and authorisation from local and national authorities.
And no, you won't be able to carry it in the cabin, it will have to be checked into the hold.