Battle of Britain II

I've been mulling over how Britain might defend itself from an all out Soviet attack from the air.

Here are the parameters

1. Britain is outnumbered 4 to 1
2. They have the VT fuse.
3. Radar is at end of war effectiveness.
4. British pilots are well trained.
5. Spits, meteors and Vampires are the planes of the day

The Soviets
1. Have extended the range and ceiling of of their aircraft enough to range all over the British Isles.
2. Yak 9DD, Yak PD, Yak 3D, Yak 15s, and Mig 9s are the fighters.
3. Pe 2s, Tu2, IL10, Mig 9s are the bombers and ground attack
4. Soviet pilots are well trained

What kind of tactics would the RAF use? How would they overcome the odds?

Most military planners of the day predicted that the RAF would last less than a month. How could they do better or even defeat the Reds?