Guide to win this:
1) Lay mines and use more grenades! You had like 300-400 munition after 15 minutes...make use of these! Mines do really hurt a british player.
2) A stuka would have been helpful for the OKW player to counter all the team weapons.
3) Blob your Raketenwerfers and try to sneak upon an enemy tank. It always good for a nasty surprise. You dispersed them all around the map. A single Raketenwerfer is no good against a churchill.
4) And again, scout with infantry or raketenwerfers in front of your tanks. Your tank often operate in the first line. Remember: Tanks need someone to scout for them!
EARLY GAme:
mistake 1: You build a raketenwerfer, there was no reason for it.
mistake 2: Your stormpioneers got a panzerschreck, there was also no reason for it.
mistake 3: Try not to run into the british mgs.
If everything fails: BLOB MORE and PRAY!!!