Just to say that your statutory rights under the Consumer Rights Act 2015 are separate to any aftermarket consumer warranty that the dealer may have provided in addition.
Since you still have a few more days left until 17th March (when the 6 months statutory period expires), I suggest that you have a good read online and possibly also consult a citizens advice bureau:
Online free advice from Citizens Advice to help you find a way forward, whatever the problem. Our research enables us to campaign on issues affecting people's lives.
www.adviceguide.org.uk
Buying a used car is a great way of cutting costs as most new cars lose value in the first year. But you need to know your legal rights.
www.theaa.com
"[BWear and tear[/B]
The dealer’s not liable for fair wear and tear, where the vehicle broke down or the fault emerged through normal use, nor are they liable if they drew your attention to the full extent of any fault or defect before you bought the car.
....
Between 30 days and 6 months
If a fault comes to light after 30 days but before 6 months you’re entitled to a repair, replacement or refund.
It’s assumed in law that the fault was present at the time of purchase unless the seller can prove otherwise.
Unless you’ve agreed otherwise, the seller (dealer) has only one opportunity to repair (or replace) the faulty vehicle after which, if they fail to repair it, you’re entitled to a refund.
In the event of a refund following a failed attempt at repair during the first six months the seller may make a 'reasonable' adjustment to the amount refunded to take account of the use that you’ve had of the vehicle."
To clarify, the wheel beating and thermostat and other things may or may not be considered as acceptable fair wear and tear under the Consumer Rights Act 2015, I don't know - my point is that it does not matter how these are considered under the dealer-provided warranty, instead it only matters how these are considered under the Consumer Rights Act 2015.