Hastings to London Can you help?

I always go on holiday in the uk, i get weekly bus tickets to travel all over, if i go to Llandudno i can get a ticket to take me all the way to liverpool if i wish, or Great Yarmouth tickets go all the way to Norwich, but i can-not find a good deal to travel out of Hastings, can anyone help ? or is there a train ticket that is flexi ?