Most venues do have a no tent rule tbh, If you are mainly only going out in the summer just get a brolly, I have a sonik axs shelter that I mainly use,I did get a front for it, but rarely use it, these can sometimes be found for a decent price and it's a great shelter.
Again beds don't have to cost the earth, if you look about there are some decent bargains to be found. But to me it's an essential bit of kit.
If you can wait til carp show season, there were some good deals at the Essex one also keep an eye on certain online shops, they do some good deals from time to time.