Ten years after they saved her life, a Lambourn woman taken on a marathon challenge in aid of the Thames Valley Air Ambulance. Antonia Roskill took part in the London Marathon – her first marathon – and she finished in an impressive 4 hours 46 minutes, raising more than £3,500 in the process. And after Sunday’s event, she has spoken about why she wanted to say thank you to those who saved her life that day back in July 2014. Mrs Roskill dropped her three young children at a friend’s house and headed over to a nearby field where the family’s ponies were kept, alongside some other horses. It was…