what a wide open question you pose. virtually any DSLR will do the job.
When considering buying a camera there are several basic questions you need to think about
1 cost of camera
2 adding lens costs
3 memory card costs and that is a subject on its own with MB/s and GB (look that up)
4 camera support mono or tripod
5 type of head - ball -fluid- geared -pistol grip etc
6 Tripod load carrying capacity
7 full frame or crop sensor camera
8 spare batteries
Now you get some idea of what you are asking. let alone camera make. New-used or grey import to add to the mix.
With a £700 budget, I’d spend £400 on a 70-200 quality lens, the Reston a s/h enthusiast camera and kit lens.
You’ll always have a desire to upgrade your camera, however... it lessens if you don’t start with a’beginner’ camera (they’re literally designedto be outgrown). And spending on a decent lens for your desired purpose will mean that never needs upgrading.