Hi Steve
I tried to book the Wonder of China on 29 August from Manchester and it seemed to be working fine. I suggest having another go - if it still isn't working, give us a ring on 0844 567 8844. Our holiday advisors will be happy to help.
Sometimes a regional flight isn't available because the service just isn't operating that day or because it has sold out. That date would be around the Bank Holiday weekend, which may be affecting availability.
Kind regards,
Olly, your editor