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Thanks for your question.
The law states that up until 6 months after the sale of the vehicle, it's up to the dealer to prove that the fault (ie. the inadequate roof seal) wasn't there when he sold it to the purchaser. This is called the "Reversed Burden of Proof".
I would take it back to the dealer and approach the situation in a constructive manner stating that you like the car and do not wish to refund, but would like this remedied by them (for no charge). If they difficult then state that you are aware of the above reversed burden of proof and that it is their duty to remedy. You may consider posturing an application for a full refund as a bluff to scare them in to repairing.
If they do not accept that there is a fault you should state to them that this will prompt you in to getting it examined by an independent mechanic and you will seek to claim the cost from them and are prepared to make an application at Court for the loss if necessary.
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