>>>20minutes every 6 hrs isn't much
To be pedantic, it's not actually 20 minutes every 6 hours. If your working day is up to 6 hours long you're not entitled to any statutory breaks (although, as been suggested above, health & safety consideration will apply to certain tasks). If your working day exceeds 6 hours you're entitled to a SINGLE 20 minute (unpaid break). If your shift is 12 hours, 18 hours, or even longer you're still only entitled to ONE 20 minute break, not two or three.