Hi Darian, Searchin For Above Found Some Info You May Already Have But Will Give It You Anyway.
David Medvidoff
In the UK, Naturalisation Certificates and Declarations, 1870-1912.
Name: David Medvidoff
Age: 26
Birth Date: 10 Dec 1885
Birth Place: Cherkass, Kiev
Record Type: Certificate of Naturalisation
Relationship: Self
Event Date: 25 Apr 1912
Event Country Region: United Kindom
Residence Year: 1912
Residence Place: Glasgow
Father: Isaac Medvidoff
Mother: Esther Feiga Medvidoff
David Medvidoff
In the UK, WWI Service Medal and Award Rolls, 1914-1920.
Name: David Medvidoff
Military Year: 1914-1920
Rank: Private
Medal Awarded: British War Medal and Victory Medal
Regiment or Corps: Royal Tank Corps
Regimental Number: 304986
Previous Units: 18 Highd. L.I. 28727 Pte, 14th Tank Corps 304986
Other Records: Search for 'David Medvidoff' in other WWI collections
War Diaries (France, Belgium, Germany): Search for 'Royal Tank Corps' in the WWI War Diaries (France, Belgium, Germany) collection
War Diaries (Gallipoli): Search for 'Royal Tank Corps' in the WWI War Diaries (Gallipoli) collection.
Received The Victory Medal & The British War Medals.
David Medvidoff
In the British Army WWI Service Records, 1914-1920.
Name: David Medvidoff
Gender: Male
Birth Date: abt 1886
Enlistment Age: 30
Document Year: 1916
Residence Place: 608 Gallowgate, Glasgow
Regimental Number: 304986
Regiment Name: Royal Tank Corps
Number of Images: 33
Form Title: Short Service Attestation
Other Records: Search for 'David Medvidoff' in other WWI collections
Family Members:
Name Relation to Soldier
David Medvidoff Self (Head)
Isaac Medvidoff Father.
Documents are There, But Unable To Send Them On Here.

I hope some of this helps you, tho' not on Jessie but info at least on the Family.

Harry.

Yes, I have these, but thanks.