Depends on the the campaign design, but it should be entirely possible to win that as Brits, even though it looks unlikely at the moment given how much airplanes the enemy has. Last mission it was at first me, Task Force and one AI Spitfire against about 20 109Es and 10 He-111s, not to talk about an unknown amount of Stukas and maybe some Ju-88s somewhere around. The AI was naturally shot down quickly, Task Force soon after that and Hunter and Oberon got caught up in combat elsewhere, so there I was all alone in the middle of all that. "Home, James!"
