How much is it on the Humber Flyer from Grimsby to Hull?

I want to meet a friend in Hull and the only way i can get there is via the Humber Flyer. The trains cost about £30 return because they have to go all the way around. I think it used to be around £2 for the Humber FLyer bus but since it nearly got cancelled last year i believe it's gone up. Does anyone know how much it costs from Grimsby to Hull on the Humber Flyer?