My ferry arrives into Portsmouth at 18.15 on Friday, and I'm hoping to get the 19.22 train from Portsmouth Harbour Railway Station to Bristol... My question is, is an hour enough time to get off the ferry and to the station? And what's the best way of getting between the two? Bus information is sketchy at best but I would rather not get a taxi if at all possible...

Please please help, I need to try and get this running like clockwork before I attempt it!