It should be fixed priced but they told that they need to use special machine and it would cost £390 incl VAT. They lied that there is a lot of work to do maybe 40 minutes or maybe 2hours. I was alone at home with crying kid so actually I was forced to agree. I am not a plumber so I thought that for 2 hours work it normal price. They used that machine for 5 minutes maximum. After 5-7 minutes work was done. When I asked about 2hours job, they simply started to show me that water is running, that everything is ok. So I have not even see that they used it. I just heard sound for few minutes. In the evening my husband called them with complaints as he has agreed for the fixed price, not for the £390 for 5 minutes work. They were very rude and all their arguments were “you know nothing, you were not there”. But they told him that we have 12 months guarantee. That calmed us down. After few months the problem with blockage appears again. I called them about guarantee and now a woman told me that I had to pay for CCTV examination 4 months ago otherwise I have no guarantee (which was not offered or mentioned). So it is my problem. I live in this apartment for 19 months before the first kitchen blocked drain appeared. Now after their £390cost work it appears after 3-4 months. In my opinion it means that the work was not done properly. They do not want to listen to my complaint as they “could not discuss what was 4 months ago” (the words of the person on phone ). THE COMPANY SHOULD BE SUE