The supplier may only claim a set-off or exercise its right of retention to the extent that its claim is uncontested or has become res judicata.

供应商仅在其权利主张不存在争议或已有判决的前提下方能行使抵销权或保留权。

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Kenton Cool, who lives in Gloucestershire and has climbed Everest 10 times, has set off in a bid to become the first to claim the trio.

BBC: Kenton Cool attempts to climb three Himalayan peaks

Others point out that all exploration costs can be off-set against any tax liable ones, and that a claim can go back as far as 25 years.

BBC: Ireland 'close to oil billions'