Fritton is a village in the English county of Norfolk, situated some 9 km (5.6 mi) south-west of the town of Great Yarmouth and 11 km (6.8 mi) north-west of the Suffolk town of Lowestoft. It should not be confused with the village of the same name near Morning Thorpe in Norfolk. ~Wikipedia
Lovely building, perhaps a little scary looking back then ! Still operating as a Post Office but with limited opening hours. I am unable to find the Postmaster around this time.