The Colour.Network site is owned and managed by the Society of Dyers and Colourists. The main website of the SDC is sdc.org.uk and content from Colour.Network is being moved to sdc.org.uk and then Colour.Network will be closed down.
As part of these updates and improvements Colour.Network is no longer accepting User Registrations and instead you should visit the main SDC website and Register there.
Thank you for your understanding and patience.