Don’t even think of contacting Aviva if your new MG4 has not yet been registered.
I used Go Compare and followed the link to Aviva. Quoted about £420. Website says no problem if you do not know the registration number. It’s actually a big problem as they will quote but you cannot buy. There’s no way to contact Aviva to speak to a human when going through a price comparison site.
I have other Aviva products so logged onto their portal and requested a quote which was about £650!! As an Aviva customer I was able to call them. They confirmed they could issue the policy without the registration number. They refused to match the cheaper quote Via Go Compare.
I went back to Go Compare which suggested Quote Me Happy. I followed the link and bought the insurance without any issue. The absurdity is that Quote Me Happy is owned by Aviva.
I shall use this insurance so that I am insured when I collect my car next week. I’ll then seriously consider cancelling and going elsewhere. For me Aviva is a money grabbing unhelpful and unethical organisation. Avoid them. And certainly don’t waste your time if your car has not been registered