There are, of course, specific rules for the Battle of Britain including the table layout, formation flying, bombing targets, radar and night fighters, the last of which looks like a really interesting addition to the system. Overall, the new period specific additions to the basic rules are very well thought out and should give a historically realistic feel to the game. In combination with the starter pack of selected TD 1/600th scale planes, the whole package represents excellent value for money.
I doubt I'll be taking the plunge into Scramble for Britain at the moment, however, as I already have plans for Mig Alley which should come first in the list of things to do. I've also got quite a few planes in 1/300th for Bag The Hun, so should focus on that first when it comes to the Battle of Britain. On the other hand, I like the system and the TD planes so much that I might just add a few more Spitfires, Hurricanes, Stukas and the so on to the collection, just in case I feel the need to do 1940 in a smaller scale and at a larger level.