How to get CITES certificate in UK? and elsewhere for shipping items with ivory

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It is getting v difficult for shipping agents to accept items for shipment if the invoice clearly state the item contain ivory material. The most direct solution is probably to obtain CITES certificate for the item but how difficult/easy is this?

Can anyone explain for example if we want to ship out from UK to elsewhere?

1: Who can apply for this certificate? Designated shipping agent? any other specific people that can handle this?

2: How long will it take from time of application to getting it?

3: Cost involved?

Thanks in advance for comments and response.