The prices from QS seemed competitive but I really wish I had bought from anywhere else. I spent over £2,200 but then had over two months trying to deal with failed deliveries, broken items being delivered, responsibility denied, re-ordering, chasing up refunds etc. My installer left, the whole project ground to a halt. In the end I had to order a toilet from elsewhere and hand over 40+ pages of emails to my credit card company to raise a disputed transaction. This has been an incredibly frustrating company to deal with - you cannot telephone product support, managers will not come to the phone, etc. I have been without a bathroom for 3 months so far and am down nearly £700 as a direct result of choosing QS supplies.
As a result or now reading so many other negative reviews of QS I will follow the advice to also contact Citizens Advice/Trading Standards.