ok Tony reel your neck in, I'm not having a pop at you
you asked a question and I answered it, ( which I notice you have avoided on my question) I do have experience of carpet fitting but not exclusively and its not to extent that you have but I can still spot a fitting fault when I see one and in my time used to carry out reports for the likes of John Lewis, Harrods etc on customer complaints regarding carpets and furnishings.
On the picture above, if I was asked to inspect, it would be straight forward recommendation to uplift and replace at the fitters or his employers expense.....Unless;
As an experienced carpet fitter you would expect that he would have advised the customer (and his company) that this property would be experiencing draught movement and as such if the carpet was fitted with out dealing with the air movement 'first' then the likelihood is that severe draught marking would appear, around the skirting's, stair posts and even through floor board joins.
I have and I bet you have, seen the complete outline of a floor 'through' the carpet as a result of severe draught marking.This can be mitigated to a point by laying paper underlay (not newspaper) under the underlay and sealing it with tape and also sealing the joins around where the skirting's meet the floor, this was done as standard years ago by John Lewis, I have no idea if it still is..However even after doing all this some draught marking may still appear in properties especially those of age and in inner cities where air pollution is higher...If this is made aware (and they sign off on it) to the customer and the employer/contractor and they refuse the extra cost (because many see this as just an 'add on') then you are covered when it occurs.
In the example above he 'has' punctured the backing with the kicker,draughts would move 'between' the underlay and the carpet causing those marks, it would not be necessarily that he has also punctured the underlay.
So it would be tough fighting this one even after doing the above in my opinion and presumably he would have been aware of the problem beforehand (or his employer would) as they woud have visited the property beforehand and seen it on the previous carpet when doing the survey and quote, if not then the property its self and the location would flag up a potential problem.
I hope this explains where I am coming from and it is not a criticism of any ones ability to do there job,
(You have to be so careful now days people are so touchy, must be the hot weather
)