Hi Claire,
For my long run I normally start in Fullwell Ave (where I live) run down to Fullwell Cross, down Forest Road, through Hainault Industrial Estate, up the hill by Hainault Forest to towards Ghigwell church, along Manor Road (past Manford Way and Grange Hill tube station), down Fencpiece Rd, through a couple of side roads back to Fullwell Avenue then back to Fullwell Cross and down Forest Road to Fairlop Waters, turn around back to Fullwell and along to the end of Fullwell Ave (The Glade end). Does any of that make any sense to you? I'm going to do my long run tonight because me and a friend are running the BAD 5 in Barking on Sunday.