I read once that a German general (cant remember which one) planned to launch an attack on England just days after France surrended.

He planned to use every airborne soilder he had along with as many fighters as were available, They were to be dropped into England around an area that had several air fields. These were to be secured and then fleets of Ju 52 transports carrying 2 divisions of Germanys best Infantry would land.

They would then start spreading out, Firstly towards the beach, and then inland. While this was happening Fighters would use captured air fields and Ju 52 transports would continue to bring up more troops and equiptment.

The plan was shown to Goering who approved it, But when Hitler found out about it who orded it stopped, He wanted to give England the chance to surrender. I wouldnt know why he would do such a thing.

At the time England had only a few fighters, Almost no army. They only had one fully equipt division except it still had only minor motorisation. In some cases they had a single artillary gun to defend a 2km area of beach. While yes a naval group would suffer casualties on there way over on the landing there forces would ripp the British troops apart.