Have you considered a tent from the
Decathlon Quechua range? They are excellent value. My son Lewis has one of the one man ones that he uses as a pup tent when we go away in the camper van, and we are very impressed with it. It pitches in a couple of seconds as it pops up into shape as soon as it is removed from the bag. Putting it away takes a bit longer, possibly a couple of minutes once you have learnt how! Last year Lewis used it on Kintyre in gale force winds and driving rain, and it stayed up and dry when many other tents were leaking or blowing down.
The
Outdoors Show is on at the NEC in a few weeks time, and there are usually loads of tents on display, and it has been known for them to sell the display tents at a reduced rate on the last day, you just have to take the tent down yourself. We got our Equinox there about 8 years ago and got it for about 40% less that the RRP.