This article will explain why your Visual editor in Wordpress may have stopped functioning correctly.
Sometimes when updating your installed version of Wordpress with 123-reg a colon gets added into the configuration. Please follow the instructions below to rectify this if you have been affected by this miss configuration.
Login to your Wordpress Dashboard.
Under the Settings section, click on the General link.
Remove any colon from either the WordPress address (URL) or the Site address (URL).
Your domain should be in the following format: http://domain.co.uk