Composite Doors by Solidor | UK's Finest Front Doors composite doors, 48mm, Solid Timber Door, High Security Doors, Secured by Design Locking, Composite Door, Energy Efficient, Solidor Collection, Entrance Door, Duck Egg Blue Composite Door Composite Doors from Solidor are the UK's finest range of solid timber-core composite doors with unrivalled security, colour options and energy efficiency.