Britain lost something like a 1000 pilots over Northern France in 1941 flying combat sweeps intended to attrite German Fighter strength and oblige the Germans to reinforce France from other regions (Russia and the Med etc) - which it failed to do.
I would far rather those Pilots were 'lost' fighting in North and East Africa and the Far East
And perhaps take some of their Spitfire's with them
Just 2 wings of Hurricanes (80+) and maybe some Spits and a Single Brigades worth of Armor (150 tanks) - hell a mix of AMC and Humber Armoured cars would have been a serious force multiplier - provided they were used properly.
I would also abandon Hong kong and any other non essential 'enclave' - and use those forces where it mattered.
You need more than just planes, you need infrastructure. I suggest reading this book -
http://www.amazon.com/Fortnight-Inf...415719693&sr=8-1&keywords=fortnight+of+infamy
It's great but it is good and it does a nice job of pointing just underdeveloped Allied airbase infrastructure was in December 1941. They had airfields but a lot of those fields lacked revetments, parking aprons, proper anti-aircraft defenses, early warning radars, taxi ways, and all of the other things that separate an airfield from a proper air base.
Better infrastructure and raid warning (whether it is radar or some sort of coast watcher system) and the fighter squadrons whether they are equipped with Buffaloes, Hurricanes, or Spitfires will be able to take a pretty serious bite out of Japanese bomber formations.
WRT the comment about the Hurricane being outclassed by the Zero. The answer is no. The Hurricane, like the Wildcat, and like the P-40 when properly flown could match the Zero just fine and like the Wildcat and the P-40 it actually had some advantages over the Zero. The Hurricane could not match the Zero in a low speed turn but neither could anything else the Allies had - not the P-40, not the Wildcat, not even the vaunted Spitfire as British pilots deployed to Darwin discovered at some cost. Even the planes we supposedly mastered the Zero with like the Hellcat, the Corsair, and the P-38 could not match the Zero in a low speed turn. We just overpowered the damn thing.
Also keep in mind that a lot of times they were not flying against Zeroes, they were flying against Ki-27 Nates and Ki-43 Oscars.
It is also worth noting that the Dutch in the East Indies discovered that when they flew their Buffaloes with half loads of fuel and ammunition, the savings in weight allowed them to turn with both Zeroes and Oscars. Granted they were also flying the B-339 variants which did not have life rafts or arresting hooks or other "carrier" type gear so they were a little lighter to begin with.