Let me give a summary.
AI.23 series:
AI.23 (or AI.23A(?)) - not very well - detect range maybe just 20+ or 30+ kilometres.
AI.23B/S: detect range - 111km
scanner limit - +-50° in azimuth and +-30° in elevation
scanning rate - 160°/s
AI.23C/D: some modifications (
http://www.scottbouch.com/English-Electric-Lightning-T5-cockpit.html)(here's something about AI.23D)
added capability: If AI.23C/D is equiped on EE Lightning: pilots can control the seeker head of the Red Top missile manually even if the radar is in search mode instead of track / fire control mode, so that the pilot can launch the Red Top missile without alarming enemy's RWR.
All information sources is listed below.