In reply to James1982:
Fair enough. If Brighton is the plan, I personally think you're trying to squeeze too much into the day to enjoy it. I'd leave the seven sisters for another day and walk some of the downs around Brighton instead.
Devil's Dyke, Blackcap, Wolstonbury etc...
Get the train to Hassocks and go from there.
It's not much of a pub crawl along the coast road! Enjoy Brighton, it's certainly an experience. Also, SDW is pretty muddy at the minute.