Any Police officers or Customs officers can seize and detain any prohibited weapon.
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Checked Bags: YesExcept knives with rounded-blades, blunt edges without serration/teeth such as butter knives, or plastic cutlery. Any sharp objects in checked bags should be sheathed or securely wrapped to prevent injury to baggage handlers and inspectors.
If you accidentally go through security with your pocket knife, you'll likely be given four options: Take the item back and check it in your luggage. Give the item to someone who is seeing you off, if they are still at the airport. Take the item to your car.
Checked Bags: Yes Except for plastic or round bladed butter knives. Any sharp objects in checked bags should be sheathed or securely wrapped to prevent injury to baggage handlers and inspectors. For more prohibited items, please go to the 'What Can I Bring?'
Please, note that following the UK governmental guidelines it is essential to declare knives in checked luggage as well as in hand luggage. It will ensure the security of the flight and will help travellers avoid paying any fine.