I have mine cut in October when most of the garden plants are over. In September the chaps tend to damage other garden plants by accident.
I think it's a Yellow Flag Iris - British native plant
Before you re-net them check for eggs, they are bright yellow and on the underside of leaves.
RHS advice is to prune in early spring before they start to grow again.
They look like Dahlias to me. Wait and see what flowers they have.
There are laws applying to evergreen hedges that came about because people were letting Leylandii grow too tall. Deciduous hedges can be allowed to grow to any height.
If the fence is within 3 metres of the highway you can only put up 1 metre high fence without planning permission. I'm currently trying to get the necessary permission.
A is a weed, Veitch. B is a Spirea, even the RHS couldn't tell me which one as I have this in my garden.
It could be an Acanthus just not sure which one
Could be a bay tree