Just watched your youtube vid of getting lost in Preston, you were sooooo close to the right route! At @ 3mins you should have gone straight on at the lights, through two more sets, down under the Uni bridge ad througt the next lights and bear left towards the docks. Then right at the lights at the end. Should save you @ 20mins riding round the town centre which is a nightmare!
Just to let you know I won't be using the bike for a while but if you want to come over to see it just message me on here, I live in Accrington and it's dead easy to find lol.