With the garden growing before his eyes, Monty Don has plenty to be getting on with at Longmeadow. In preparation for beautiful late summer grass borders, he fills the gaps that the diseased box hedges have left with grasses he has raised from seed. Joe Swift casts his designer's eye over a city garden in London and highlights the key principles to be kept in mind when making the most of a small space. And we pay a visit to a stunning arts-and-crafts-style garden, High Glanau Manor near Monmouth, where colour and proportion come together in perfect harmony.