I took the Warwick into consideretaion because it has quite a good range: 4.200 Km. And that´s pretty much! The Wellington can go for 4.105 Km with 454 Kg ( and that´s a tiny payload). The Striling, wjhich is the best RAF bomber in this timeframe has a total range of 3.334 Km with 1.588 Kg payload. If you factor the usual wartime calculations, than 1 third of the total range makes the penetration or strike range (a distance where you may carry a considerable payload and return to your base with a reserve of about one fith or less).In the case of our Stirling it is something at 1.100 Km distance from the base. The payload increases with reduced range but thenumbers you referred belong to short distances. With 1.100 Km distance you will not reach Moscow. No Spitfire has the range to escort them over these distances. The Spitfire V has a total range of about 800 Km ( that means it can barely esort the bombers for 350 Km of their way, that is one third of their striking distance). Without fighter escort, even I-16 can wrec havoc under daylight bombers (they succesfully did in 1941, even if this means to ram the enemy)
Comparing to the Luftwaffe, the RAF in 1941 has far less planes and this makes a difference. The Luftwaffe bombers, esspeccially the Do-215, Ju-87 and Ju-88 are planes with some high degree of precision, thanks to dive bombings. Only this method ensured the impact the Luftwaffe had over Russia in 1941. The RAF bombers miss this feature, which doesn´t makes much later in the war (at a time when RAF bombers had airborne air to ground radar) , but makes a lot of difference in this stage.
Just one thing to add: Plan_D, please check the performance of Spitfire V and Mig-3 again. post any altitude where the Spit Vb/Vc (we already excluded the Va because of the worse armrment) has a considerable speed advantage over the MiG-3. Please check the altitudes between 5.000ft and 15.000 ft. A considerable speed advantage means more than 10 mp/h, 20 mp/h are comfortable and 30mp/h and more makes a huge difference. Not even at sea level there is reason to say that the Spit V outperforms the MiG in ALL situations. The Spitfie V is an allrounder but it lacks the initiative of the Mig-3. At the Spits optimal altitudes, the Mig is clearly superior, At lower alts, both are more closer to each other but why do you think the Mig is no worthy contender for the Spit V below 15.000 ft? You have to proove this.
Glider, an interesting feature in your post is the Hurr-IIc with four 20mm. But I believe the necessarities of the front would ask for the Hurr with 40mm guns. Esspeccially to deal with the heavier soviet tanks.
According to the Luftwaffe reports of 1941, the VVS was able to counter strikes even in situations where it obviously had no working CinC-strukture. To a high degree it was ineffective, but they kept on doing so. I rate the VVS / red forces in the offensive because the ground ops and air ops over the eastern front are connected much closer to each other than over any other theatre. On the ground I see more probabilities with the soviets than with the British. And with the british generalities in mind, the RAF strategic targets would be of small military worth but moreso in mind of Douhets theories to break the enemys attitude to keep on fighting. This would be a nasty buisness but without hope of success, I assume. The VVS on the other hand directly fought against military targets, oil fields, airfields, ammo and fuel depots, troop concentrations and so on. O fcourse they had the Pe-8, wich is in 1941 quite comparable to the Stirling, if not even better, but they refused strategic campaigns because of the need of direct (visible) results. Some few propaganda sorties against Berlin (without bombs, I remind) and VIP transports, thats all for them.
A problem of the Hurricane is that it was not superior to the VVS planes. Even the I-16 could be a problem for the Hurricane (some versions of the I-16 made 525 Km/h and that´s pretty much), not to speak of the Yak-1, Lagg-3 or Mig. The Hurricane would be a very easy AA target and very vulnarable, too.