Why A400M tankers do not mirror US Marine carrier support

Should British carrier groups receive two A400M tankers like US amphibious ready groups use KC-130s?

Not under the current system; Britain lacks the basing, spare aircraft, and service model that make the US Marine KC-130 arrangement work.

Britain does not use the A400M as its principal tanker and has too few airframes to assign a standing pair to each carrier group. Overseas basing has also contracted, making it unclear where such aircraft would operate from during distant deployments. The US Marine Corps' KC-130 arrangement reflects a distinct legal and organizational solution: cargo aircraft can perform refuelling even when a dedicated tanker fleet is restricted. British carrier aircraft already operate from a movable flight deck and can also draw on Voyager or allied support. The answer therefore treats tanker support as a system of basing, ownership, and force structure rather than a simple two-aircraft purchase.