Thanks for the reply, but I need a little more advice.
Here is the most recent email from this company:
"What I would also wish to say is that you will appreciate we are bound by the supply of external goods by other manufacturers, thus we have no control of those goods supplied to us. We are quite prepared to assist and try and resolve this matter but do so strictly without any liability to do so in respect of goods that were subject to warranties of an independent manufacturer (now bankrupt).
Our proposed solutions are as follows:
If you accept any of our solutions, this will be in full and final settlement of any dispute arising between us and in so far as third party products supplied by us, we do not warranty these, such warranties rest with the manufacturer of that product. "
Although solution 2 would seem to be the best option, they appear to be saying that they know they are sub-standard doors and so they'll replace them but it's my own problem if they go wrong and also there is no mention of disposing of the existing doors or making good any decoration that may be damaged in the process.
Solution 1 is unacceptable as I could not replace the doors for £1047 (I have no personal quotes on replacement as yet) and again, the onus is then on me to resolve the issue myself. The £900 outstanding is just the remaining payment from the staged payment of the entire build.
Solution 3 seems to be saying that they will replace with a better product but that I would have to pay the additional cost which I don't see why I should do.
In any case, they are saying that they take no responsibility for what happens after the doors are fitted.
Your advice on my position and next steps would be very much appreciated.
OK - so I also spoke to Trading Standards who pointed me at the Supply of Goods and Services act 1982 and suggested I write to the company. What I want to say is that I will pay them the outstanding £900 after they install replacement doors of satisfactory quality and make good any decoration or damage, and remove from site any waste. Additionally that they remain responsible for any future defects - is that OK or are they able to maintain that any warranties are with the manufacturer? Can I also claim any compensation for the delay as they have been promising to replace the doors since agreeing they were faulty in March 2013 ... as the doors won't lock I can't secure my office and as they don't open beyond a certain point, I haven't been able to use them either.
They are being very stubborn about this and i'm sure it's going to mean actually filing a claim against them so I need to be sure what I'm claiming. Can I just get a quote from a local supplier and claim that as the value, or does it have to be the value they quoted from their supplier (i'm guessing i wouldn't get the same deal from a supplier as they do as they have significantly more buying power!)