The 12-year-old Queen Eleanor Technology College pupil was competing in the national qualifiers of the Charles Owen Pony Racing Series where he was the youngest rider.
Alex, a member of Fitzwilliam Hunt Pony Club, qualified to compete in this series by winning a designated Young Riders Point to Point race a Cottenham in March.
The BBC televised Charles Owen Summer Series is run at 19 professional racecourses over the country culminating with the final at Aintree in October.
It is open to riders aged 12 to 16 and is a fiercely competitive event that includes the top riders and ponies in the country.
They all must carry a minimum weight of 8st.
This is Alex's first season and once again he excelled, reaching the frame and the winners enclosure with a fast finish to take fourth to last years national runner up.
That means Alex still has a great chance of reaching the televised final at Aintree in October.
Alex, who was facing more experienced jockeys, did not have his cause helped by his weight. The youngster weighs just 6st and had to to carry nearly 2st of lead in his saddle to make up the minimum weight requirement.
Newmarket's really soft ground did not make it any easier for his racing pony, Crosswell Robbie who was the national Champion in 2004.
Alex, who is sponsored by Treehouse Sporting Colours, said: "I got a bit of a bump off another pony at the five furlong point which put Robbie off its stride.
"I was patient with him until the two furlong pole then he found his racing rhythm again and when I asked him to quicken he really started to stride out to the line and passed some really good ponies to finish fourth in a hot race.
"I think the recent work on the hills at Wittering Grange Equestrian Centre has helped with his stamina as he now has to race for nearly a mile with the extra weight'.
Alex's trainer said: "His biggest attribute is that he understands the mind-set of the horses he rides and gets a real tune out of them, which is a rare quality for somebody so young."
As well as his normal training Alex has attended courses at the British Racing School in Newmarket.
He and Crosswell Robbie usually train at Wittering Grange Equestrian Centre and at the classic winning racing yard of Pam Sly, who won the 1000 guineas at Newmarket in 2006 and is one of the sport's most famous names.
Alex's next race is on Saturday, June 30, at Towcester racecourse.