Here is his commission into the Army Ordnance Corps in 1915:
LG 2-1-1915
ARMY ORDNANCE DEPARTMENT.
The undermentioned Warrant Officers from Army Ordnance Corps to be Assistant Commissaries of Ordnance, with the honorary rank of Lieutenant. Dated 3rd January, 1915: —
Thomas Percival Hutchinson Pearsall.
http://www.london-gazette.co.uk/issues/29027/supplements/127(Gazette search registered name as Peareall)
Note that he is a serving Warrant Officer (highest non-commissioned officer rank) at this time.
Also, LG 20-9-1940
THOMAS PERCIVAL HUTCHINSON PEARSALL, Deceased.
Pursuant to the Trustee Act, 1925, Section 27.
NOTICE is hereby given that all persons having claims against the estate of Thomas Percival Hutchinson Pearsall late of " The Glen ", Woodrow near Chaddesley Corbett, Worcestershire retired Captain who died on the 25th day of July 1940 and whose Will was proved in the Principal Probate Registry on the 9th day of September 1940 by William Percy Hill must send written particulars of such claims to the undersigned Solicitors on or before the 3Oth day of November next after which date the deceased's assets will be distributed having regard only to the claims of which notice shall have then been received.—Dated this 17th day of September 1940.
H. G. IVENS and HILL, 112, Coventry Street, (032) Kidderminster.
http://www.london-gazette.co.uk/issues/34949/pages/5607Steve.