Subject: Re: Ty Mawr/ Great House Farm/ Red Fen (Cedfin), Llandough, Cardiff
From: Sion Buckler
Direction: sent
Date: Tue, 30 Jun 2026 22:28 UTC
Institution: Ordnance Survey
Refs: none
Archive id: gm-19f1aa5d5d6d832e
------------------------------------------------------------

Thank you

Sion

On Tue, 30 Jun 2026, 07:50 FOI,   wrote:

> Dear Sion Buckler
>
>
>
> Thank you for your email of 27 June 2026, requesting information from
> Ordnance Survey in accordance with the Freedom of Information Act (FOIA)
> 2000, in relation to the historical depiction of a property and surrounding
> land historically referred to as Ty Mawr / Great House Farm.
>
>
>
> Having reviewed your request, in our view this does not appear to be a
> request for information as defined under the Freedom of Information Act
> (2000).  A valid request for recorded information will be treated as a
> request under the FOIA, unless it is a routine enquiry or for information
> that is dealt with as part of our routine business.
>
>
>
> We consider your request to be for mapping information which is dealt with
> as part of our routine business.  As a result, rather than dealing with
> this as an FOI request, we have forwarded your email to our Customer
> Services team as we feel they will be better able to deal with your
> request. Our Customer Services Team will aim to respond to you within 10
> working days.
>
> In the mean-time, we do have some information about Historical mapping on
> our website: Historical map archives | About us | OS
>  .
>
> You can call customer Services on [phone redacted], or contact them via Live
> Chat   which is available
> Monday to Friday 08:00 -18:00 (except for Bank Holidays). Outside of
> these hours, you can use the Contact Us
>   form or email
> [email redacted].
>
>
>
> Yours sincerely
>
>
>
> *Kim Furlong for the FOI Team*
>
> Legal Services
>
>
>
>
>
> Adanac Drive, Southampton, [postcode redacted], United Kingdom
>
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>
> *From:* Sion Buckler  
> *Sent:* 27 June 2026 16:56
> *To:* FOI  
> *Subject:* Ty Mawr/ Great House Farm/ Red Fen (Cedfin), Llandough, Cardiff
>
>
>
> *External Email:* Take care with attachments & links.
>
>
>
> 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
>
>
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> Thank you for your cooperation.
>
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