Bf-110 is THE fighter

[Blue 5]

You also forget that there were the exact words of the british command leaders saying that the german campaign would have continued with the initial strategical targets, they would have been forced to admit defeat in less than 2 weeks, as they actually were right on the edge.

Umm, that's completely untrue; Parks talks about being in an 'uncomfortable situation'. He is very sanguine about the probability of winning, stating that given losses of aircraft and pilots vs output, the RAF will probably win in the end. Given he had more aircraft and pilots on strength in early September that he did at the end of July, and only Manston had been rendered unuseable as a full-time base, he was right.

Despite what was written in the 1960s, Fighter Command at the time were fairly optimistic based on the data they had. 1,030 vs 825 fighter losses on both sides by end of September (not that they had precise Luftwaffe loss rates) shows why they were right. The 'Narrow Margin' is a myth, like the 'useless 110'.