If the details on the policy issued don't reflect the actual details of the vehicle and person being insured, the policy holder is still liable iirc.
It's up to the policy holder to ensure that there have been no mistakes (can happen even when dealing directly with the insurer), and telling a third party (broker or the like) something and having them pass it on doesn't absolve you of any responsibility if/when it's found to be wrong.
At the very least you could possibly end up with voided insurance, it's also possible if the details of the car do not match up with the details on the policy when issued, or when first payment is taken that you have committed fraud - something that any insurance company and most employers will take seriously if found guilty (not to mention various countries immigration - the US for example).
Basically using this loophole if your car doesn't have braided hoses is very, very silly, regardless of if you apply for it via the third party site or not.
*and if memory serves, 6 points = retest time for new drivers.