Manufacturers:  
Meggt New owners of the (formerly Sylva) Mojo, based near Rugby
Sylva Autokits The Riot and Spectre, based in Lincolnshire
Spectre Sportscars Southern agent for Sylva Autokits
Stingray Motorsport Distributor of Sylva kits, based in Ripley
RAW Engineering   The (formerly Sylva) Striker; Toyota 4AGE engine experts
Stylus Sportscars The (formerly Sylva) Stylus
Fisher Sportscars The (formerly Sylva) Fury
Cyana Cars The (formerly Sylva) Phoenix
Useful Sylva Resources:  
JPSC   Jeremy Phillips Sportscars Club - for all Sylva genre cars
Sylva Chat Friendly google groups chat list
Sylva Drivers Frappr Map Great way of finding out the location of other Sylva drivers
Useful Non-Sylva Resources:  
Westfield Sports Car Club Useful forums for non kit-specific queries, plus 'For Sale' section
Lotus 7 Club Forums Caterham forums with some info on Zetec engines and Weber carbs, plus 'For Sale' section.  Unfortunately only members can post to this forum, but it is still useful.
locostbuilders Lots of useful info, from a very resourceful group of builders!
Engines:  
zetecinside Useful source of Zetec-E & gearbox info  
fms-ford-spares Ford spares at reasonable prices  
Fensport Toyota engines and other parts  
Mojo Build Pages:  
Trevor Bennett's build Good pics & Trevor used an interesting paint system
Matt Beardshaw's build The only K-series powered Mojo in existence!
Ed's build A Mojo SE build diary
Bauke's photo gallery A Dutch builder with a VTEC Mojo
Other Kit Car Pages:
Tim Hoverd's builds Including a Westfield, Dax & racing Fury
r1ot.com Riot SE build diary & forum courtesy of Richard Burgess
r1ot-act.co.uk R1 powered R1ot build diary, from Martin Boakes
Scott Makin's build pics CBR1000 powered Riot
Mistrale An interesting homebuilt mid-engined 2 seater with a 1.25 Ford Zetec SE.
Entia Racing Samir is a former work colleague who began racing the Locost Championship in 2006.