- Cloggs
- Co-op Electrical Shop
- Currys
- Cath Kidston
- Chessington World of Adventures
- Coast
- Clarks
- Chemist Direct
- Chef and Brewer
- Chain Reaction Cycles
- Cafe Rouge
- Claire's
- Carluccios
- Cult Beauty
- Chiquito
- Cat Footwear
- Crew Clothing
- CycleStore
- Charles Clinkard
- Cox & Cox
- Chelsea Megastore
- Carpet Right
- CJ Wildlife (Birdfood.co.uk)
- Celtic Manor
- Children Salon
- Celtic Superstore
- Christies Direct
- Curvissa
- Cloud 10 Beauty
- Coggles
- Chi Chi
- Cwaak
- Charlotte Tilbury
- Collectif
- Clare Florist
- Current Body
- Cartridge People
- Consoles and Gadgets
- Cartridge Monkey
- Cadbury Gifts Direct
- Cottages4you
- Currys Partmaster
- Crucial
- Cotswold Outdoor
- Crocus
- Chums
- Cheapflights
- Christopher Ward London
- Cast In Style
- Cotton Traders
- Clinique
- Credit Expert
- Casio Online
- Calendar Club
- Cosyfeet
- Caterer
- CG Golf
- Character-Online
- Clinton Cards
- Club Direct Insurance
- Choice Stationery Supplies
- Chemist.Net
- Cheap Suites
- Club-Cleo
- Celtic & Co
- Car Audio Centre
- Costa Coffee
- Caffe Nero / Cafe Nero
- Conrad Electronic
- Corel
- Craghoppers
- ClickGolf
- Cashmere Boutique
- Canadian Affair
- ChristianCafe.com
- Crafters Companion
- Choice Hotels
- CP Company
- CyberLink
- ContentWatch