OK to a point I agree with you. But, I have done it this way from the onset even with £300 tiling jobs for domestic customers. This way there is no comeback with "He Said, You Said, We Said"
Unfortunately society today is in the mindset of "Lets see what we can claim for" This country is getting much more on to the wavelength of bringing liable cases for little or no reason and the strange thing is the customer is in the winning lane before the court case. We are a "Business" and it does not matter how small or large the courts see it as " Business rips customer off " It is up to us (You) to prove you didn't agree to this or that or say this or that. A written quote followed by a written contract with all the i's dotted and all the t's crossed leaves no ambiguity. Lets be honest a Sole Trader as most are on here could lose their Business and their house if the claim was big enough. e.g. You sheet up in a house and little girl slips down the stairs on your sheet and has a serious injury or worse and the Parents decide to claim! Think about it! That is all I am saying!
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