Heavy attacks on London and Bristol.
Night: Further raids on London, Merseyside and the Midlands.
Weather: Fair in the extreme south and south-west. Cloudy in the Channel with light rain over southern England.
Main Activity:
The first sign of German activity appeared on the operations table at No. 11 Group as the 8 a.m. watch took over.
The planes were bomb-carrying Bf 110s escorted by Bf 109s. Harried by fighters from Dungeness to the outskirts of London they scattered their bombs indiscriminately.
Some Bf 109s stuck tenaciously to the London area. They had orders to protect two succeeding formations of Do 17s and Ju 88s, but the bombers did not make the rendezvous. 11 Group was ready for them and they were intercepted over the coast by a powerful assembly of Spitfires and Hurricanes which broke up the tidy German formations and compelled them to jettison their bombs.
Badly mauled, the Messerschmitt pilots over London were obliged to split up and dive for the safety of a ground-level retreat.
Having failed to clear the skies by sending fighters ahead of the bombers in the first assault, the Germans reverted at 11.30 to a split raid, sending eighty aircraft to Bristol and 300 to London.
No. 10 Group squadrons fought the Bristol raiders across the West Country and only ten Bf 110s and some 109s managed to get through. These were intercepted on the outskirts of Bristol by the Nottingham squadron, which compelled them to release their bombs unprofitably on the suburbs. The survivors were harried all the way back to the coast and out to sea.
The majority of the London raiders got no further than the middle of Kent where they were so severely mauled that they retreated in confusion. Some reached the outskirts of the city and twenty slipped through to the centre.
With 58 German aircraft missing (including twenty-one bombers) the Channel was alive with air-sea rescue planes and boats in the evening. Most of the 28 British planes lost came down on land. Luftwaffe lost a lot of fighters that day , nine of them run out of fuel due to a navigational error and crashed down on Kent coast.
from https://battleofbritain1940.com/entry/friday-27-september-1940/