Is There a Threat of a French Invasion of Mainland Britain?

In pre trafalgar, was there a threat of a french invasion of mainland britain? You know, was that serious? I yes. And it was serious. There were maybe thi would say there were two broad periods in which this was feasible. First of all, between late 17 96 and the summer of 17 98,. so duringtee war of the second collition. The last of the french revolutionary wars when the french had conquered a the netherlands, had also made an alliance with spain. This stretched the royal navy's capacity to protect home waters. So what the french had to do was to find a way of using ah this advantage and an army across