The Malta class aircraft carrier or the UK’s answer to the US Midway class was a proposed aircraft carrier design of the 1940s.
The powerplant was to be eight admiralty three-drum boilers with four shafts and four parson geared steam turbines creating 200,000 shaft horsepower giving a speed of 33 knots and a range of 8200 miles and was to have a capacity of 80 to 108 Aircraft and her armament was to be eight 2-turret 4.5-inch QF dual-purpose Naval Guns totalling 16 and eight 6-turret 40mm Bofors Anti-Aircraft Guns totalling 55 but she was cancelled in 1945
Link to the image of the ship
had the Malta been built and enter service then she probably would have had Supermarine Seafire Fighter and Reconnaissance planes, Blackburn Firebrand Fighter and Strike Fighters and Fairey Barracuda Bombers with Fairey Firefly Anti-Submarine Warfare, Night-Fighter, Reconnaissance planes and Trainer aircraft
Had the ship been active in the 1950s then it likely would’ve Hawker Sea Fury fighter and Strike Fighters with Westland W.35 Wyvern S.4 Strike Fighter with the Douglas EA-1D Skyraider AEW.1 Airborne Early Warning Aircraft with the Fireflys being switched for General Motors TBM-3S Avenger AS.4 Anti-Submarine Warfare aircraft.
The ship would probably have gotten helicopters likely Westland WS-55 Whirlwind Anti-Submarine Warfare and Search and Rescue Helicopter with Westland WS-58 Wessex Utility and Cargo Helicopter.
The ship probably would have undergone a similar upgrade to the Audacious class carriers or the US Midway class using De-Havilland Sea Vampire and Sea Venoms then going to Hawker Sea Hawks, Supermarine Attackers and Scimitars and De-Havilland Sea Vixens before her likely load out till its retirement probably before or around the time of the US Midway Class.
And this likely refit loadout would have been Boeing F-4K Phantom 2 or FG.1 fighters and Blackburn B.103 Buccaneer S.2B Strike aircraft with Fairey Gannet Anti-Submarine Warfare, Airborne Early Warning and Carrier Onboard delivery Aircraft with Sea Vixen or Scimitar buddy tankers eventually older S2 Buccaneers taking over that role.
As for the Helis well the Westland Whirlwind and Wessex Helicopters would’ve likely had their roles filled by the Westland WS-61 Sea Kings like the USN’s H-3 Anti-Submarine and Utility Sea King which took the roles of the SaR, ASW and Utility H-2 Seaprite, H-19 Chicksaw and the H-34 Seabat and Seahorse.
As for the defence armament, I believe had the ship been refit then its 16 4.5-inch QF dual-purpose Naval Guns have been more than halved or eliminated completely along half or all of the 40mm Bofors Anti-Aircraft Guns to allow four 4-rail Guided Weapon System 20 for 40 Seacat Ship-Based Surface to Air Missile and two 2-rail Guided Weapon System 30 for 40 Sea Dart Ship-Based Surface to Air Missile.
Probably in 1980s had the ship still been around would probably have the older 4-rail GWS-20 for the Seacat Ship-Based SAM and two 2-rail GWS-30 for the Sea Dart Ship-Based SAM and any 4.5-inch QF dual-purpose Naval Guns be replaced by the 2-rail 2-rail Guided Weapon System 31 for 40 Seadart-Mk.2 Ship-Based Surface to Air Missiles while any remaining 40mm Bofors Anti-Aircraft Guns be replaced by the 20mm Goalkeeper Close In-Weapon System.
I know most of this is fanfiction history but cancelled ships are more fun as you can make up a plausible history for a cancelled ship is what I find more fun