Plusbus can't be bought for short journeys within the plusbus zone, so I'm afraid that wouldn't be valid.If you live in the Brighton Area and use the buses the one to go for is Newhaven Town to Newhaven Harbour at £176.
It can be issued on the key but the real advantage is that Newhaven Town has a plusbus add on. I leave it to you to work out the rest!
In conjunction with a rail season ticket commencing from a station outside of the PlusBus area.Assume we're talking about this fare: http://www.brfares.com/#faredetail?orig=K698&dest=NVH&expert=on&flow=0&multi=0&fare=0&rte=9&tkt=PBA Newhaven+Bus to Newhaven Harbour £379?
How do you buy that ticket?