The ouija board - originally marketed as a game,- 'works' through the involuntary impulses, known as 'ideomotor effect' which propel the planchette.
To see this in action, have someone 'operate' it while blindfolded - the 'results' will be mostly unintelligible.
People eating and drinking on the go
To think that London, or anywhere else for that matter, does not belong to any one demographic