I guess I could buy a laptop and docking equipment. Not really thought of that.
Laptops are slower for the same spec (a laptop i7 is not the same as a desktop one for instance).
Laptops are not as robustly made
Laptops can't have individual bits replaced, mostly.
Laptops cost more for the same spec.
Laptops are designed to be moved around. If you don't need to move it around, there's no point at all in buying one.
And I do understand that getting a bespoke one gives you unlimited options - but I am not the most tech savvy individual and would probably end up wasting my money on functionality I neither needed nor understood.
No, you wouldn't. You've said what you want, these online shops are not sharks, they will sell you what you need.
Or we can do it for you. £1,000 is a very handsome budget for a desktop PC. Is it just video editing you want?