Errr 6 hours in a bus down to Nottingham? any reason you wouldn"t fly down like most sensible types?
Just checked return flights are £45 if you book soon they should still be around that price. Also if you think that sitting on a bus for 6 hours getting tanked before you get there is a good idea (which I must admit sounds fine having done my share of road trips with rugby teams) DTD is probably not the destination you want to be heading to as they don"t really take too well to those who have had quite a few.
Just saying and all hope you have a good time, may be there can never plan that far ahead though.