61. O&S Holdings
- Managing director: Peter O’Donnell
- Pre-tax profit: £6m
- Employment: 336
- Pay bill: £8m
O&S Doors started out as a kitchen fitter before its founders developed a niche in making and fitting PVC, vinyl-wrapped doors. Its bedroom and kitchen doors are now made and shipped around the UK and Europe.
It has over 100 separate door designs with over 50 different finishes and colours.