Plumber required

Looking for a plumber who can supply and install the plumbing for kitchen units (sink, dishwasher); Supply and install plumbing for the bathroom. After all this new boiler connection required. (i have boiler already) Job would be in 3 stages: Install waste and water supply for kitchen units. Install waste and water supply for bathroom. Disconnect old boiler and connect new boiler + connect everything to the mains. Trying to get most competitive quotes.