The CSG21 deployment has been completed successfully.
I found this the other day..
Ready for Take-Off? The Next Generation of UK Maritime Air Power
The United Kingdom views its investment in maritime airpower as an important part of its contributions to the NATO Alliance. In 2020, it committed the CSG to the NATO Readiness Initiative, alongside other inputs such as the British Army's leadership of the NATO Enhanced Forward Presence in Estonia. Reflecting its historical areas of strength, the United Kingdom also hosts Allied Maritime Command (MARCOM) in Northwood, England, and the RN regularly contributes to the Standing NATO Maritime Groups and Standing NATO Maritime Countermeasures Groups. The RAF is similarly active in supporting NATO exercises and air policing missions.
Rebuilding the capability to deploy a CSG with embarked F-35Bs and a mix of helicopters presents not only the United Kingdom, but also NATO, with a new range of tactical options. This includes the added operational flexibility that comes with increased capacity (or 'mass') and new ways of bolstering the NATO Alliance's conventional deterrence and defence posture.
This enhancement in European NATO Allies' contributions to NATO maritime airpower—alongside the smaller and older carriers operated by France, Italy, and Spain—comes at a time when the U.S. Navy's own (much larger) fleet of aircraft carriers is facing growing demands from other theatres. Most notably, the U.S. military is increasingly having to juggle its ongoing presence and commitments in Europe with efforts to deter China's fast-growing People's Liberation Army, Navy, and Air Force in the Western Pacific. The return to United Kingdom carrier operations therefore presents opportunities for the RN and RAF to 'take some of the slack' from their U.S. counterparts, either by deploying the CSG within Europe or by taking up station elsewhere—for example, in waters off the Middle East—to help free up a U.S. task group for operations in other parts of the world.
It also comes as Russia continues to develop and deploy capabilities intended to deny NATO access to waters and airspace off Norway in the event of a conflict (so-called 'anti-access, area denial'), securing Russia's northern bastion and approaches and making any Allied reinforcement of Norway a more complicated and risky undertaking. Russia's naval and air forces similarly hope to contest NATO's access and control as far as the Greenland-Iceland-UK gap, directly threatening the SLOCs of the North Atlantic that lie beyond. These waters are vital to NATO's broader strategy and resilience, enabling the safe and timely movement of troops and materiel from North America to reinforce the European theatre in the event of a crisis or full-blown conflict.
The connections with the Future Commando Force and the Littoral Response/Strike Group are also mentioned.
The RN and Royal Marines are currently developing concepts for Littoral Strike, complementing the new CSG with Littoral Response Groups (LRGs) bringing together different amphibious assets. One (LRG North) is to be focused on the Euro-Atlantic region, and another (LRG South) is reportedly to be stationed in the Middle East and spend time as far afield as the Pacific. The United Kingdom's carriers will have an important role to play, for example deploying the CSG alongside LRG (North) in event of NATO amphibious operations in the High North and enabling aerial missions in support of forces deployed on shore. In June 2021, the United Kingdom conducted tests involving RAF Chinooks and Apache attack helicopters from the Army Air Corps' 656 Squadron operating from the deck of HMS Prince of Wales. This presents new options for deploying rotary-wing assets in support of NATO operations in littoral environments, such as through resupply or land attack.