The Most Dangerous Enemy 8: Sealion
Much has been written on the viability of Operation Sealion.
Bungay does not much more than summarise the history of the plan as it made its way through the various German organisations. This includes the pessimism and general obstruction of the Kriegsmarine, and the almost foolhardy optimism of the Luftwaffe.
It also dwells a bit on the rather half-hearted planning efforts at the highest level (OKW) and ends with the fairly well-spread assertion that Sealion, if it had been attempted, would have amounted to little more than an enormous gamble that might have paid off.