Posted: 15/09/2016 at 23:43
First photo looks like a form of impatiens which is frost tender but can be brought in and treated as a houseplant over the winter.
Agree about antirrhinum, cistus and coreopsis. Cistus is hardy as long as it doesn't get its feet too wet in winter. Coreopsis are short lived perennials that don't much like UK winters so are often grown as annuals. Worth trying to over winter in a frost free greenhouse.
The iris look like iris sibirica. To keep these flowering they need to be lifted and divided every 3 years and replanted in soil improved with garden compost and they appreciate a handful or two of pelleted chicken manure in spring. You can also cut out the spent flowering stems when they go over as this stops the plants wasting energy on seeds.
They also need their foliage - as long as it's green - to keep them fed and healthy so cutting it back will weaken the plants. It can safely be tidied up once it all turns brown and flops. Maybe trim back the lawn a bit to create a new edge?