Under 'major deployment', I mean all Hurricanes, Battles and Blenheims; Lysander is supposedly under Army control so they also go. Deployment is more or less completed before April 1940. Obviously, defense of the UK is done by Spitfires, Defiants, while the Gladiators are in Scotland. Big bombers also stay in the UK.
What might be the odds that German anslaught is halted in Belgium, or around Sedan, or at both locations? RAF losses? Other pros and cons?