In reply to Sam Beaton:
Just get any cheap 2 person tent. If weight isn't an issue then you wont gain much with a more expensive tent. If it's windy, pitch it on the lee side of your car but for a small tent you're unlikely to have a lot of issues with wind anyway.
Tents are insanely overpriced. I have a gelert solo which I was going to recommend but it would be unnecessarily small for car camping. I have used it for high winter camps in scotland and it's stood up to some heavy abuse and high winds over about 20 years. A 4 season tent will get flattened if you pitch it badly, a small tent pitched well will stand up to a lot. Think it was £25 when I got it. You can pick up a very similar looking tent for about £60 now, or you could spend £500 on a modern lightweight model.
The highlander blackthorn 2 would be a good option for you. Similar size, weight and material spec to the tetri but half the price.
Post edited at 12:27