 
 <prompt> Wetin be di system wey go replace AI? Based on di last question, write one context wey contain di answer. E fit be 1 - 20 sentences. Context: <response>: Airborne Interception radar (AI) bin dey unreliable. The heavy fighting for di Battle of Britain don chop up most of Fighter Command resources, so dem no really put money for night fighting. Bombers dey fly with airborne search lights out of desperation[citation needed], but e no really dey work well. GL (Gunlaying) radar and searchlights with fighter direction from RAF fighter control rooms get beta potential to start GCI system (Ground Control-led Interception) under Group-level control (No. 10 Group RAF, No. 11 Group RAF and No. 12 Group RAF). 