Beading is used to cover the expansion gap around the edge of a wood floor. It is fixed to your existing skirting rather than the floor, so the floor can expand and contract under the beading.
Scotia
Scotia is the most popular option.
It is available in MDF white or wood effect finish (both of which can be overpainted) or solid (unfinished) oak.
Quadrant
Quadrant is another option.
As with scotia, it is available in MDF or solid oak.