On 12 Jan, 14:33, Charlie Pridham wrote:
Either use a roundup type weed killer with a sprinkle bar (having drawn
the required outline) or cover the whole area in woven membrane and
plant through it (this can be a pain later), either way mulch with
something after planting. it will be a lot less work long term if you
give yourself a proper edge other wise the grass will re colonize from
the edges.

Eddy could also cover the area required with newspapers, soak them
well and cover the papers with soil. Eventually this smother the grass
and turf. Some will poke through but he can hand pick them easily. The
soil added on top should be of good quality which would later benefit
the plants planted in the bed, giving it a good start.