Distribution of PLANKs 1750-1850 (IGI)
View this map in county fill form.
Each red dot represents a place where one or more birth, baptism or marriage events took place.
There are 92 places where PLANKs are mentioned with 37 of them in Wiltshire.
Of the 646 events 429 are in Wiltshire. The only other concentrations of PLANK events are in Surrey with 77 and London & Middlesex with 72. Hertfordshire does not appear unlike the pre 1750 period. But there are now clusters at Edinburgh (Midlothian, Scotland) and at Canterbury (Kent).