I'm a cyclist, a biker and a car camper and I'm still looking for the perfect tent.
At the moment I've got a 3 man for the bike (tent will fit in my topbox when it's all packed up) and a 5 man for the car. Made the mistake with the 5 man of having the big sleeping area (standing up room; I'm 6'4") and the smaller porch. It will just about take two bikes, but the chairs and the table then need to go in the sleeping area. Usually take a small tarp and lock the bikes together under the tarp at night and if we go out in the car.
I will certainly be thinking about the Quechua T4.1 for my next tent (or something in that style). I did notice in the new Argos catalogue that Regatta have developed a range of tents. Checking on the Regatta website, it would appear that they are only selling them through Argos. I've not found any reviews yet, but I'd certainly be interested based on how long some of my Regatta clothes have lasted.