The RAF had 50 squadrons of Spitfire in June 42 (nearly all MK Vs, few MK IIs, bit later some Mk IXs), they were producing 350 fighter pilots a month (and planes). They were facing just JG 2 and 26 in France (from memory).
They had such an overwhelming numerical advantage that they could have given each Spit pilot a club, ordered them to fly over the the airfields, bail out over them (or land) ... and club every Luftwaffe pilot to death.
Hoping, of course, that they managed to avoid the flak on the way.
There was no need to worry about defences, the Luftwaffe never did any further daylight operations of any note and RV Jones promised that he would give 6 weeks notice of any new (and night, hence the Spits would be useless) bombing campaign.
And they were well aware that the Germans weren't going to attack, again? They knew, in advance, that Russia was not going to be defeated, and that the planned four-engine bombers (which were expected) were never going to happen? Really? It's a shame you weren't there to soothe their fears, and set them straight. I think you'll find that the inhabitants of Plymouth, Portsmouth, Liverpool, Hull, Southampton, London, Birmingham, Exeter, Glasgow, Belfast, and sundry other towns, didn't feel there was no need for any defences, when they were getting killed every other night.
They already starved the ME (inc Malta) anyway, N.A. only got Spits (2 squadrons whoopie do) at the end of '42. And Malta (again from memory) only got 4 squadrons.
So the Hurricanes and P-40s, which were sent, didn't amount to a can of beans; I'm sure the pilots will appreciate being written off so easily. I take it you don't know how difficult it was to conjure up a filter suitable for desert use? Eisenhower asked for Spitfire IXs, to cover "Torch," but couldn't have them, due to inadequate filters.
Slap a 30 gal tank in the rear, fix a bob weight to the elevator circuit, hang a 45 gal drop tank and send them right over the Luftwaffe's airfields. Escort bombers right to them if they still don't come up to fight.
Easy in theory, but not in practice; read the Spitfire V manual, and you'll find it mandatory that the extra fuel tank could
only be used in conjunction with the
90-gallon ferry tank. There was also no direct fuel line from the tank to the engine (pilots weren't too keen on sharing the cockpit with fuel, for some reason,) so the fuel must go through the ferry tank, and be used first. If the aircraft was jumped, and jettisoned the fuel tank, there was no means to dispose of any fuel remaining in the rear tank, which meant that, as the fuel drained out of the front tanks, the aircraft became progressively less stable, and impossible to control. This love of the bob-weight is interesting, since experienced pilots didn't like it, due to loss of manoeuvrability, and Mike Crosley was of the opinion that it killed more pilots than it saved, since, when a pilot inverted the aircraft to abandon it, the weight worked in the opposite sense, and slammed the elevators hard up, giving the pilot no chance to get out.
The thing to note is that by making an incorrect assumption
Which is what you're doing.
The Luftwaffe never got much above 1,000 fighters at any point. Even when they increased production they couldn't supply the pilots and attrition meant that their operational numbers basically stayed constant.
With the RAF being able to clear France, Belgium, etc in the air meant that the Luftwaffe would have had to bring fighters back from the eastern front (etc), creating a battle of attrition which the Luftwaffe could not win.
All of which employs 20:20 hindsight, and wasn't known at the time.
Even the Mk.IX couldn't have a rear fuel tank fitted, without major modifications, and it was the end of 1942 before they could make the trip from Gibraltar non-stop to Malta. Incidentally, as for Malta being "starved," 431 Spitfires arrived there, between March and October, 1942.
I'm sure, too, that those pilots who went as far as they could, to meet, and escort home USAAF bombers, will be pleased to know they were just "twiddling their thumbs."