Wheelchair sprinter Mickey Bushell upgraded his Beijing silver to gold in London with victory in the T53 100 metres.

The 22-year-old, the world record holder, got off to a flying start and raced away from the field to win in a new Paralympic record 14.75 seconds. Bushell was 0.34secs clear of the field as he convincingly claimed Great Britain's fifth gold medal in the Olympic Stadium.

He was born with seven vertebrae missing from the lower part of the back. Bushell, whose win took Great Britain's athletes' total medal tally to 12, revealed he had been inspired by watching David Weir's 5,000m victory.

He said: "Gold was the only thing I wanted. I know I had to work for it, it's been a long, hard four years. Last night I watched Dave Weir and as he crossed the line I was bouncing off the walls in my room. I didn't know what to do.

"He's been a massive influence - just as a team-mate, he's been there for me. He was there for me in Beijing as well, even with all the stuff he had to deal with as well. He's a fantastic guy, a great role model to look up to."

On the race, he said: "It was fantastic. It went a lot better than I thought. The crowd were fantastic, they definitely pushed me on. I nearly cried coming through the line."

Ireland's Michael McKillop sealed his status as the world's greatest Paralympic middle-distance runner by making it double gold. The 22-year-old, who has cerebral palsy, obliterated the opposition to claim the most convincing of victories in the T37 1500 metres.

He had a season's best coming into the race more than 20 seconds faster than the next quickest in the field and it proved as comprehensive on the track as it looked on paper. Content to sit behind Australia's Brad Scott early on, he passed him before stretching clear from way out, already acknowledging the applause of the crowd as he came off the final bend.

His times of four minutes 08.11 seconds was a new Paralympic record and more than six seconds ahead of Scott. Great Britain's Dean Miller, who had been a medal contender, could only manage seventh.

McKillop's success came two days after he landed 800m gold in equally emphatic fashion. And it took Ireland's gold medal total in the Olympic Stadium to three, sprinter Jason Smyth having started the ball rolling.