We had a Chestnut kitchen from Cash & Carry in our last house - great value - don't believe you'll get anything cheaper. All their stuff comes ready assembled so if you're any bit handy on the DIY front you could consider fitting yourself. If not, they can also fit. Couldn't fault them.
Also worth checking out...
Panelling Centre, Express Kitchens, B&Q, Keen Kost Kitchens
Also worth checking out...
Panelling Centre, Express Kitchens, B&Q, Keen Kost Kitchens