Absolutely no references to hand, but I seem to remember reading that...
1) V-1 could be shot down by guns, but the risk to the fighter was high due to the proximity to the exploding warhead
2) Upsetting the missile by wing tipping would result in the warhead exploding on the ground (in open country), hopefully avoiding damage to the fighter
3) In the particular case of the Meteor, the failure of the cannons was a problem and so tipping was the only option left
Heroes the lot of 'em.