What are these bells called?

[Ted Steele]

This picture of three small bells hung to be rung together has appeared 
on a church visitors list. Apparently the bells are rung when the Priest 
enters to commence the mass and information is sought as to the name 
given to such bells.  I could only suggest that they are Sanctus bells, 
but does any one know differently? The bells are in a church in Hoxton, 
London which has no tower.

Ted

           
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