Kate Stanforth was on course for top marks in her A-levels when suddenly she was forced to leave school after getting ME (myalgic encephalopathy). After a long battle for her health, today she collects her A-level results in maths and textiles. Kate is one of a small but growing number attending 'virtual schools' - using online, real-time teaching. Nisai, in Stockton-on-Tees, is one of the companies trying to introduce the concept to the UK, but funding is scarce