The Luftwaffe was very effective against ships. After virtually wiping out the Dover-based 4th Destroyer Flotilla (nine ships plus two replacements, not all were sunk but all were put out of action), mainly by Stuka attacks, and sinking other warships in and around Portland (Foylebank, a brand-new AAA ship and the destroyer Delight), the Admiralty specifically forbad destroyer ops in the Channel in daylight.
This was weasel worded by the RN Historic Branch chap in the programme as:" the navy had good night fighting capability", or some such.
Also liked use of the "Euro Anthem" as background to Hitler and goose-stepping Nazis post France campaign.