I have to laugh at comments like this, especially when your own business did not succeed, Im sorry but you are that reason.
Why is £35 a piss take? take off the governments VAT that leaves £28 for the dealer to buy a wiper blade, make a SMALL profit, and pay someone to fit it.
Is that too much to ask when you are in business?
And to follow that, - "dealer have huge profit margins" they feckin do not!
I had spent nearly 20 years in dealerships, managing departments, and the people who have the margins are the brand, not the franchised dealer who if they are lucky will make a nice margin of 40% on a £8 oil filter, general service items are good to sell, but the likes of suspension and steering components, slow moving items dealers are lucky if they get given a 10% margin from the brand.
They pay for a massive training package for the techs (if they are a pukka dealer - which LR are) and when you take a car in to be looked at they should look at it as if it was comparable to a new vehicle, not - oh well its just a little amount of play, or well I will leave that cracked under tray and not tell the owner.
Just mention 'Duty of care'.
BTW, VW Sharan undertrays are £270 cost plus vat to VW
I am stepping down now
To the OP, you are within your right to simply hand it back for a full refund, just don't take too long at it.
The warranty will only be named components, and for mechanical.