If you need 2 batteries then this offer is very good: http://www.diy.com/nav/fix/power-tools/drilling-screwdriving/drilling/cordless/Bosch-18v-Li-Combi-Drill-2-Batteries-11227751
(Bosch green with 2x 18V li-ion batteries for £99).
I have the 14V version I picked up for £50 for general drilling and screwdrivering of wooden frames etc (have an SDS for other stuff) and I was amazed by how good it is and I’ve been using it for brickwork, concrete etc. tbh you just need to make sure you have decent drills bits.
I normally go for Bosch blue or Makita stuff and yes it’s not as tough or built to last but for occasional home use then don’t be put of bosch green.
If I was buying another I would probably go for the makita li ion on screwfix (or a bosch blue) for around £150 but my use justifies it.
Avoid nicad and don’t dismiss mains power if you are not going to benefit from battery.