Update.
Tree surgeon came round for a site visit. He thought planning could be tricky given the problem trees and recommended the best, and first, course of action is to speak to owners (with cakes/tea) of problem conifers and suggest removal and replacement with suitable hedging.
Beech and Birch healthy but need slight trimming.
Removal of hedges, stumps, re plant, trimming of beach & birch. C
Just over £1000. Pricey or about right?