Just a few links, I will add more as I come across them..

 

Manufacturers
http://www.robinhoodengineering.co.uk/ This is where my kit is coming from
http://www.banmoco.ndirect.co.uk/ Convert an existing car, no SVA !
http://www.westfield-sportscars.co.uk/ Very posh kits
http://www.daxcars.co.uk/ Another popular kit
   
Newsgroups
news:alt.autos.kitcars  
http://groups.yahoo.com/group/robinhood2b One of the ones I use..
http://www.rhocar.org.uk/home.asp And this one..
   
Insurance
http://www.adrianflux.co.uk/  
http://www.graham-sykes.co.uk/  
http://www.insurance4kitcars.co.uk/  
   
Accessories, Tools and Parts
http://www.machinemart.co.uk/  
http://www.woolies-trim.co.uk/  
http://www.speedshack.co.uk/  
http://monospares.homestead.com/  
http://www.comdir.co.uk/ Clips fixings etc, online ordering
http://www.s-v-c.co.uk/ Stafford Vehicle Company
http://www.raldes.co.uk Loads of spares and stuff..
Misc..
http://hometown.aol.com/DVAndrews/index.htm Very useful info