This is really spooky, but we have just solved my daughter's Ka problems. they are exactly the same as you describe. 03 Ka - three headlamp bulbs blown at �35 a go, flickering red battery lamp. TWR is right keep away from the main dealer but search out by recommendation a good and reliable small proper garage or a good auto electrician.
The problem was identified by a brilliant two man back street garage on the south coast who appreciate return business and therefore do a good job for sensible money.
The fault was a fuse blown and a broken wire in the loom along with a loose terminal at the alternator. Mainly laboutr because he had to take the front wing off for access, but problem found and sorted. No flickering light now and all electrics A1. Should deal with the bulbs blowing as well.
I don't know where you live, but downhere all done for ninety quid.