Sanctus vs Service Bells

[philholtsdgr]

I appreciate that there is a difference in the ecclesiastical 
definition of Sanctus and Service bells, but am I the only person to 
suspect that there are also geographical factors involved? Using on-
line Doves there appears to be a distinct area largely following a wide 
band either side of the Fosse Way in which the name Sanctus bell is 
used. Are they genuinely used at the elevation of the Host, or is it 
the term a dialect survival to the English Civil War or earlier?

Phil Lucas