After the fall of France, photographic reconnaissance came under the control of Coastal Command, using types including Spitfires, Wellingtons and Hudsons. The duck-egg blue camouflage gave way to deeper PR blue for high-altitude operations and a pale pink for low level work.
The Battle of Britain was fought between 10 July and 31 October 1940. At the beginning, Fighter Command had 27 squadrons of Hurricanes and 19 of Spitfires and it was the Hurricanes that bore the brunt of the fighting. Between the beginning of July and the end of October, 565 Hurricanes and 352 Spitfires were lost.
During the Battle, 19 Squadron was issued with half a dozen cannon-armed Spitfires, designated Mk IB as opposed to the eight machine gun-armed Spitfire, the Mk IA. The cannon's hitting power was recognised but jamming was still a problem and little success was achieved. Nevertheless, further cannon-armed Spitfires were issued to 92 Squadron and it was eventually realised that the best mix was an aircraft with two cannon and four machine guns.
The performance of the Spitfire Mk I and the Messershmitt Bf-109E was very similar. The former possessed a better turning radius at any height and was slightly faster below 15,000 feet, but the Messerschmitt was superior in the climb and marginally faster above 20,000 feet. The Messerschmitt's Daimler-Benz DB 601A engine had the advantage of fuel injection which enabled the aircraft to bunt (push negative g at the top of a manouvre or climb) without losing power. The Merlin engine of the Spitfire had a float-type carburettor which necessitated the aircraft performing the longer manoeuvre of rolling inverted before diving to maintain positive g, thus preventing the engine from cutting out as a result of fuel starvation.
On 24 September, the Luftwaffe raided the Supermarine works at Woolston, on the outskirts of Southampton. Little damage was done to the factory, but nearly 100 workers were killed when a shelter was hit. The area was bombed again two days later, killing 30 more and severely damaging the factory, halting production. This resulted in plans being implemented for the large scale dispersal of production facilities to some 60 different sites. On 30 September, the Westland factory at Yeovil, which had just begun to prepare for Spitfire production, was bombed by He-111s. As a result of these raids, only 59 Spitfires were produced in October, less than half the total for August - indeed, such was the need for fighters that a Spitfire fitted with a pair of Blackburn Roc floats was reconverted to a standard Mk I. The trial of the Spitfire as an amphibian had been mounted because of the lack of suitable airfields during the Norwegian campaign and the need to seek alternatives. Never again did production fall so low.
In August, VHF radio was fitted to a Mk I of 19 Squadron for the first time. However, HF equipment was not fully replaced for another two years.
Late in 1940, the first examples of the Bf-109F were encountered over Southern England. it proved far superior to the Hurricane and more manoeuvrable than the Spitfire above 25,000 feet. The Spitfire Mk III was still in the development stage and thus there was an urgent need to fill the gap.
After winning the Battle of Britain, Fighter Command quickly went on to the offensive. On 20 December, two Spitfires of No 66 Squadron flew the Command's first patrol over France since its fall. Such operations by pairs of fighters were known as 'rhubarbs'. They were to prove expensive.
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