Originally Posted by
Ardaghman
"I'm going on this trip for the ***** ***** newspaper and I would need the correct answer, and not an opinion, if that's OK?"
The correct official answer can be found in the legal section of EI's website, in the General Conditions of Carriage. The correct practical answer has been already been provided by the previous posters

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8.3 ITEMS UNACCEPTABLE AS BAGGAGE
8.3.1 You must not include in your Baggage:
[..]
8.3.1.3 Items which are reasonably considered by us to be unsuitable for carriage because they are dangerous, unsafe by reason of their weight, size, shape or character, or which are fragile or perishable having regard to, among other things, the type of aircraft being used. Information about unacceptable items is available upon request.
[..]
8.3.4 You must not include in Checked Baggage money, jewellery, precious metals, computers, personal electronic devices, negotiable papers, securities or other valuables, business documents, personal medication, passports and other identification documents or samples.
8.3.5 If, despite being prohibited, any items referred to in 8.3.1, 8.3.2 and 8.3.4 are included in your Baggage, we shall not be responsible for any loss or damage to such items.
8.7 UNCHECKED BAGGAGE
8.7.1 We specify maximum dimensions and/or weight for Baggage which you carry on to the aircraft. Baggage which you carry onto the aircraft must also fit under the seat in front of you or in an enclosed storage compartment in the cabin of the aircraft. If your Baggage cannot be stored in this manner, or is of excessive weight, or is considered unsafe for any reason, it must be carried as Checked Baggage.
[From the Baggage section of EI's website: "Baggage, labelled at check-in, must weigh under 6 kgs/13 lbs"]
8.7.2 Objects not suitable for carriage in the cargo compartment (such as delicate musical instruments), and which do not meet the requirements of 8.7.1 above, will only be accepted for carriage in the cabin compartment if you have given us notice in advance and permission has been granted by us. You may have to pay a separate charge for this service. Details of applicable charges are available upon request from us or our Authorised Agents.