Agree with above on getting one of a "good" range. Makita (I have), DeWalt etc.
If you need spare batteries at any point be very careful to get genuine brand name. There are a lot of knock off batteries that look like Makita etc ones, but are not. They skimp on cell quality and safety electronics inside the plastic. These are Lithium ion batteries and can burn with great fierceness when they go wrong. Buying a spare battery, or two at the same time as you get your drill, or angry grinder, from the likes of Screwfix, or Toolstation should be fine, but beware secondhand and Ebay.
Jen