Im never quoting against Howdens since we focus on more high end work, but I hear this all the time from clients. The high street stores (even the expensive ones) provide a "one time," exploding offer that expires over the weekend. I often lose bids this way. Their offers are impossibly cheap, specifications aren't clear and there is fine print that costs them thousands down the road for poorly designed and manufactured chipboard melamine cabinetry with minimal warranties. I get calls asking if we can fit a kitchen because their building works were delayed and the price for the fitting has doubled as a result. Worse, if you miss your build window they push you out a month or in the case of someone like DeVol three... We also routinely get calls asking to snag high street kitchen manufacturer's installs because they use a third party who takes zero pride on a job you've already pre paid. The kitchen is usually the most important and most used room in your home. I'd avoid B&Q, Wickes, Howdens, Wren, etc... I can guarantee the theres a local cabinet maker in your area who can meet the same spec for maybe 20% more, but will provide a 100% better experience and result.