Even with Germany having a half year edge on the A bomb I dont see Hitler using it on England or the US. I dont think he would risk the US dropping one on his house. If you hit England you still risk massive US casualties due to the amount of troops stationed there by that stage of the war. Those large casualties would get a "not so friendly" response from the US. Russia on the other hand would probably cease to exist. Hitler would bomb that country off the map. As we know, the US used 2 A bombs on Japan when they were already in the process of being defeated. The US would definately use them on Germany if they dropped one on England.

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The soldier above all others prays for peace, for he must suffer and bear the deepest wounds and scars of war. General Douglas Macarthur