Guest Stars Iwan Rheon as Rob Tanya Reynolds as Gwynn Daniel Lloyd as Singer Bethan Bevan as Dog Walker 2 Steve Speirs as Steve Rhodri Miles as Doctor Rebecca Jade Hammond as Meg Nia Trussler Jones as Dog Walker 1 Sasha Latoya as Ciara Hannah Cadec as Mermaid Bois Y Bryn as Shanty Singers
