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2ah will be fine for most drilling and impact driving, if you could get a bit bigger it would probably be better though. Aall my batteries are older, when I think the smallest was 3ah.
Powertoolmate are my go to for things like this, and are quite often cheaper than screwfix\toolstation. Their website is awful, but a new one is launching next month. They also have a facebook group that they post deals in, it's heavily milwaukee skewed, but they do occasionally have Makita deals, including batteries.
You should be able to, but I couldn't see anything reasonably priced and delivering soon after a quick search, if you know anywhere to look I'd be very grateful! Also re battery sizes, just seen screwfix have the kit at a really good price with 2ah batteries. I would imagine these would be fine for my needs, especially with 2 supplied to swap between if necessary...