What would you like to know about this?
When did you buy?
How much did you pay ?
How old is the car?
In principle you are in time to reject the vehicle under the Consumer Rights Act.
In practice they might resist though and then you would be left with the option of suing.
The consumer rights act is still largely untested by caselaw as it is a fairly recent statute. It is expected that there would be some restrictions upon the right to reject.
Even if that fails though, you would be entitled to a repair. If it is beyond economical repair then you would be entitled to other remedies such as a rejection or an exchange.
Can I clarify anything for you?
If a fault exists then they need to resolve it.
Whether you can insist really depends on whether or not they are willing to comply though. You can ask. They may refuse. If they do you can sue.
No. I am sorry but the consumer rights act does not go that far.
Unless their guarantees include a hire car, you would not be entitled to one.