I suspect that this will prove difficult to resolve as you would like.
The airline are the people to contact, since they employ the baggage handlers, and it is with them that your son had a contract. Easyjet's terms and conditions state:
Quote:
If your baggage is damaged, lost or delayed during an easyJet flight, you must advise a member of easyJet ground handling staff at the airport of arrival immediately.In the event of loss or damage to baggage the airline's liability is normally limited to a maximum of 1,000 Special Drawing Rights (approximately £820). We will not be liable in any event in respect of loss or damage to
baggage which is not permitted to be carried (see "baggage" above).
Passengers are advised to take out their own insurance to cover the value of their baggage and its contents, particularly if they are carrying important or valuable items. Claims are dealt with up to the airline's legal limit of liability and must be supported by appropriate evidence of loss or damage.
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What they say cannot be carried in checked baggage includes what they term 'valuables'.
Claiming from the airline will be much the same as dealing with an insurer; they are limits on how much they will pay, they will ask for proof of value and ownership, and they will attempt to reject claims if (for example) the bag wasn't suitable for its contents, or wasn't locked, and so on.
I doubt that either the airline or an insurer would accept responsibility for any consequential loss (such as loss of earnings).
In general, it will probably be quicker to claim off insurance, and let them pursue the airline. The PIR (property irregularity report) that your son should have got before leaving Newcastle Airport will be crucial, and it will be worth getting a photocopy.