No Limit in Time
50 is L in Roman Numerals
12 Lines on the Underground
14 Lines in the London Underground System
1000 mL = 1 L so 20000 mL = 20 L. Simple, really!
Fifth-Generation Language
17 yak liquorish
3 Way Light Bulb
284 Tube Stations in London
8 legs on the empress of the racnoss
who recorded the song 200-3AB
49 Balls in the Lottery (UK)