Competing for Shaftesbury Barnet Harriers, Nachshen followed this by taking the South of England U15 800m indoor championship in 2:15.03.
“The 800m was a tactical race rather than a time trial,” said Nachshen, “and altogether it has been a really good start to the year.”
Lia Radus set an 800m PB of 2:18.70 at the Lee Valley New Year Open and placed second at the Middlesex U20 cross country Championships.
Radus, 16, commented: “I was very happy with my solid start to the season in the 800m.
“I don’t enjoy cross-country so much, and could perhaps have performed slightly better in the Middlesex race, but I was mentally tired from my GCSE preparations.”
Her younger sister, Maayan, 13, recorded 2:31.83 for the New Year’s Day 800m and placed fifth in the Middlesex U15 Cross Country despite illness earlier in the week.
London Heathside athlete Jack Davis-Black placed fifth in the Middlesex U15 boys cross country championship, while Bini Bloom, 14, produced an excellent time of 18:18 in the St Albans park run.