Rudi Davies recurring character in the show, Grange Hill was written out after season three because she was filming another project; she did re-appear in one singular episode in sesaon five with the rest of the original cast.
Davies began her acting career as Penny Lewis in the BBC school drama, Grange Hill. Her character was written out, stated to have had a horse riding accident offscreen. She did not return for Series 4, due to filming Forever Young. She reappeared, alongside the rest of the original cast, in a single episode of Series 5. 
