Based on the photos I can see the Coleman Carlsbad Dark Room looks like it might be what you are looking for except for the price. Its only $152 in the US but when I switch over to Amazon UK it is £256.
This tent might also work and is only £128, never heard of the brand though. Edit: I guess this might be what you are referring to already in your post.
Also have this one
Coleman Dome Tent with Screen... https://www.amazon.com/dp/B019YDV6A6?ref=ppx_pop_mob_ap_share
6 person