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I am sorry but probably not. Thats not to say you don't have other rights but you cannot reject it on this basis.

I imagine this was a deal done in store so the distance selling regulations will not apply. That will mean you will not have automatic cooling off rights.

You may have cooling off rights under the contract. If you do then you should use them as that will allow you to cancel.

If there are none then you will have to drop down under the Sale of Goods Act.

The SoGA give you rights to demand that this is fit for purpose. Clearly it is not. However, the question is remedy. Case law has developed in such a way that it is very difficult to reject a second hand car. You pretty much have to show that its falling apart. A water leak is not sufficient I'm afraid.

You have rights to demand a repair though. And you are only under an obligation to give them a reasonable time to perform the repair. If they do not then you can reject it. But you have to give them reasonable chance.

I'm sorry this isn't the answer you wanted but it is the position that you face and I have a duty to inform you truthfully.

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