addendum to divenyi suggestion

[Sheila Williams <S.Williams@xxxxxxxxxxxxxxxxxxx>]

There are in fact areas of Britain (Newcastle, as the most common instance)
 where TV reports sometimes get subtitled for the rest of us Brits.

Perhaps Yorkshire might be a good place for a study as there are many local
 accent and dialect variations so maybe areas within less than 100 miles where
 there are communities which don't understand each other.

I guess you would need to find genuine locals to find out if this is the case,
 not an outsider (from 75 miles away) like me.

Sheila Williams