The first thing that came into my head was Incarvillea but after looking it up now I'm not so sure. Very nice plant anyway.

Is the pink one an onrnamental form of tobacco plant?

Mirabilis jalapa, also known as 4 o'clock plant and Marvel of Peru - frost tender though. Comes in a range of colours and colour breaks.

It forms a tuber which can be dug up and stored like Dahlia tubers.

Also seeds like mad. If you don't want loads of these growing next year, remove the small black pea size
seeds.

Thank you everyone