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
I currently have badgers digging up a nest under my conifer hedge. It appears that bumble bees are a major part of their natural diet.
Mameha, you might find this RHS advice helpful.
It could be an Eryngium (Sea Holly). They self seed in my garden