Lockdown Gatherings

A group of friends arranged to meet in a Sainsbury's.
They'd devised a communication system to throw staff off the scent.
"Where's my 250g Red Label?" said one.
"I think some extra mature cheddar might be in order."
The two chuckled.
Other members of the gang wandered clockwise through the aisles.
They were consulting their dictionaries.
Trying to decipher this mess.