Sites that can help
HMRC - Tax advice, National Insurance advice
Companies House - Registering your Business / Company
Federation of Small Business - Good help lines and membership benefits.
TTNC - Business telephone numbers and call forwarding service
Xero - Beautiful accounting software
Capsule - Easy, online CRM (Customer Relationship Management) for doing business
Highrise - Small business CRM, Web contact manager
Google App's - Web based email, calendar and documents for teams (free)
Skype - Online chat (free)
Mailchimp - Easy e-mail newsletters (free version)
XMind - Mind mapping and storming (free version)
Dropbox - Online file storage (free version)
Inkscape - Drawing package (free version)
Gimp - Image manipulation (free version)
OpenOffice - Free office and productivity programs (free)
Contractors Marketing Services - Experts in construction sales and marketing