« Reply #5 on: Thursday 15 July 21 01:22 BST (UK) »
I think you need to email them via the contact facility on the website. If I understood their "fond" system and ref numbers I might be able to understand what they've actually got. Although it does seem that about two fonds are early enough to assist. I have Norfolk ancestors and during WWII some vicars thought they'd bury their precious books/records in case their churches were bombed. Unfortunately one vicar couldn't find the exact burial spot and years later when parishioners eventually found the records after several years of looking, they weren't legible because they'd been put in an ordinary canvas rucksack and were ruined due to the ground getting wet.
I'm finding more and more of my old favourite websites have vanished or "modernised" so they are less than useful. However, as Church of England records only began after the closure of monastaries circa mid 1500s you're nearly at the end of your quest, unless you have families that owned land.
Speaking of land: the Anglo Saxon suffix "ing" means "family land". However, as the prefix of "Down" is an old word for Dunn/Dark (haired), it seems the meaning of the name doesn't give a specific place in Norfolk.
Do those two lines that you are following use a naming pattern? If so you may be able to trace movements of them around the UK using the English and Irish NAME DISTRIBUTION maps.
https://www.familysearch.org/wiki/en/Surname_Distribution_Maps.
Curiously, the results show a couple of places in Ireland where the surname Gosling appears.
Aberdeen: Findlay-Shirras,McCarthy: MidLothian: Mason,Telford,Darling,Cruikshanks,Bennett,Sime, Bell: Lanarks:Crum, Brown, MacKenzie,Cameron, Glen, Millar; Ross: Urray:Mackenzie: Moray: Findlay; Marshall/Marischell: Perthshire: Brown Ferguson: Wales: McCarthy, Thomas: England: Almond, Askin, Dodson, Well(es). Harrison, Maw, McCarthy, Munford, Pye, Shearing, Smith, Smythe, Speight, Strike, Wallis/Wallace, Ward, Wells;Germany: Flamme,Ehlers, Bielstein, Germer, Mohlm, Reupke