Let me tell you about my garden. I have a family of muntjacs living in it. Every single thing except daffodils and mature trees is surrounded by wire netting. (Even then they get through.) Tulips are eaten to the ground; the young growth on all my roses is so severely browsed that the plants barely recover late in the summer; viburnum flowers are systematically nipped off; bark is stripped from the flowering dogwoods ... I could continue.
As muntjacs inexorably spread, others with fewer rolling acres than Mr Mabey will experience what they can do and perhaps there will be less of this wonderful tolerance.
A M Whitehead