Hi Suziq
as Newfly said earlier, it is to do with the parish not the actual marriage licence
According to my Oracle:
Peculiar jurisdiction of the Archbishop of Canterbury
‘Peculiars’ were those parishes or places which were exempt from the jurisdiction of the bishop in whose diocese they were physically located, and were answerable directly to another. In the case of the archbishop, he exercised episcopal jurisdiction over a number of parishes in various parts of southern England outside the diocese of Canterbury. For administrative purposes, these parishes were formed into eight deaneries: the Arches (city of London parishes); Bocking (Essex and Suffolk), Croydon (Middlesex and Surrey); Monks Risborough (Bucks., and Oxon.), Pagham, South Malling, and Tarring (Sussex), and Shoreham (Kent).
Chris in 1066