Subject: Ty Mawr/ Great House Farm/ Red Fen (Cedfin), Llandough, Cardiff
From: Sion Buckler
Direction: sent
Date: Sat, 27 Jun 2026 15:55 UTC
Institution: Ordnance Survey
Refs: none
Archive id: gm-19f09cb101e038e4
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Ordnance Survey Historical Enquiries Team,

I am writing to request information regarding historical Ordnance Survey
mapping and naming conventions for a specific area in Llandough, near
Penarth, Vale of Glamorgan (Wales).

I am researching the historical depiction of a property and surrounding
land historically referred to as Ty Mawr / Great House Farm, and I am
trying to understand how its labelling and placement may have changed
across Ordnance Survey map editions.

Specific mapping references
The area I am examining includes the following Ordnance Survey historical
map references:
38-1-608
38-1-334

I am also comparing Ordnance Survey map editions from approximately the
1950s through to the early 1970s.

Mapping issue being investigated
From comparing available historical map editions, I have observed the
following:

Earlier Ordnance Survey maps (pre-1950s / early 1950s) appear to
consistently show the name Ty Mawr / Great House Farm in one field or
parcel location.

In later editions (circa early 1970s), the label “Ty Mawr” appears to shift
position between adjacent parcels, and the descriptor “Farm” appears to be
applied or positioned differently than in earlier mapping.

There also appears to be a change in how the surrounding land parcels are
labelled or visually grouped.

What I am seeking clarification on
Could you please advise:

Whether Ordnance Survey records show any map revision notes, resurvey
information, or internal documentation explaining changes in naming or
label placement for this area between approximately 1950 and 1975
Whether changes such as the movement of a name between adjacent parcels
would typically result from:

resurvey work or updated field recording
cartographic generalisation or redraw practices
changes in naming conventions or feature classification
Whether OS holds any guidance or archival material explaining how estate
names or farm names were assigned, repositioned, or reinterpreted across
map editions in this period

Which historical Ordnance Survey editions or map series would best show the
most accurate progression of naming and label placement for this specific
site

If possible, I would also appreciate guidance on accessing any archived
mapping sheets or revision history material relevant to this location.

Thank you for your assistance. I appreciate your time in helping clarify
how Ordnance Survey mapping practices evolved during this period.

Kind regards,

Sion Buckler (Ret'd Sergenant)
Military Cyber & Electronic Warfare Professional
Life Member @ Royal Signals