Didn't include fitting as they're just a vendor, but I used AppliancesDirect when I got our Rangemaster 90cm dual fuel. Delivered into the house, unpacked, checked and everything.
Bear in mind that the potential gas usage on a range cooker is significantly greater than a standard hob and that this may affect the pipesize requirement from the meter. The installer should be able to advise and do a running test when it's fitted as part of the commisioning.
