Image caption Flt Lt William Walker joined the RAF a year before World War II broke out

The oldest surviving pilot from the Battle of Britain, who was shot down in his Spitfire and wounded in 1940, has died aged 99.

Flt Lt William Walker, born in Hampstead, north London, suffered a stroke last Thursday.

He died in hospital on Sunday, the Battle of Britain Memorial Trust said.

The Battle of Britain was the German air force's attempt to gain air superiority over the RAF from July to September 1940, early in World War II.

Their ultimate failure was one of the turning points of the war and prevented Germany from invading Britain.

Bailed out

Born on 24 August 1913, Mr Walker joined the RAF Volunteer Reserve on 2 September 1938 at Kidlington, Oxford, a year before the war started, and piloted his first solo flight there a few days later.

The Battle of Britain Image caption Spitfire fighter planes played a decisive role in the Battle of Britain By the summer of 1940, the Nazi war machine had conquered much of Europe and had Britain in its sights

On 18 June, 1940, Churchill gave a speech announcing: "... the Battle of France is over. The Battle of Britain is about to begin."

Despite being outnumbered by the Luftwaffe, the RAF showed resilience and determination when attacks began in mid-July

By October 1940, Hitler had abandoned his plans for invasion

An estimated 1,023 RAF and 1,887 Luftwaffe aircraft were lost between 10 July and the end of October 1940 Source: BBC History Listen to Winston Churchill's rousing 'Finest Hour' speech Why Churchill ignored calls for WWII peace talks and vowed to fight on

He was called up for full-time service on 1 September 1939 and posted to Cambridge on 15 November.

He went to RAF Brize Norton, in Oxfordshire, on 17 February 1940 and, at the end of the course, was commissioned and posted directly to 616 Squadron at Leconfield, in East Yorkshire, on 18 June.

On 26 August 1940, a large German bomber force, with heavy fighter escort, was heading towards targets in England including the RAF fighter stations at Biggin Hill and Kenley.

The force was engaged over the Kent coast by Defiants, Hurricanes and Spitfires.

At Kenley, Spitfires from No 616 South Yorkshire Squadron were scrambled to the Dover and Dungeness area of Kent and found themselves in a fight with Messerschmitt Bf 109s.

Mr Walker's plane was hit and and he bailed out, landing in the Channel with a bullet in his right ankle.

He clung to a shipwreck on the Goodwin Sands before being rescued by a fishing boat, transferred to an RAF launch and brought ashore at Ramsgate, where he was greeted by a large crowd and presented with a packet of cigarettes by an elderly woman.

Souvenir bullet

In later life, Mr Walker enjoyed recounting the story of how, as a surgeon prised the armour-piercing bullet from his ankle at the RAF Hospital, it shot out and hit the ceiling.

He kept the bullet as a souvenir.

Battle of Britain Memorial Trust chairman Richard Hunting CBE said: "Flight Lieutenant William Walker was a warm, engaging and friendly man who always had a twinkle in his eye.

"He knew how important it was that we continue to tell the story of what he and the rest of the [pilots] did in 1940."