You will require either a mobile signal, or WiFi, in order to create a DJI account and also to activate the new drone.
After that, the only time it ever needs the internet is if you wish to have maps available.
Maps are a personal thing, many use them, many don’t.
Due to DJI price fixing the Mini 2 is the same price everywhere.
The Mini 2 is too new to be discounted by DJI yet. But if / when it’s put on offer is on offer everywhere for the same price (price fixing, remember).
We have a thread over here that tracks all the offers:
As recommended by @McSteamy2010 above, I’d also only buy from Argos or Amazon. Same day delivery, hassle free returns.