Searched the Times for you today as well (summaries as these are images only)
The Times, Monday, Jul 16, 1860; pg. 1; Issue 23673; col A (classified ad)
P. C. Stortz, of Liverpool - photographs of the officers of the Duke of Lancasters Own Rifles (militia) have been submitted to H.R.H. the Prince Consort, at Osborn-house, on the 12th inst. and are now on VIEW at Mitchel's library, 33, Old Bond-street.
The Times Wednesday, Jul 18, 1860; pg. 1; Issue 23675; col A
- same ad run again.
The Times, Tuesday, May 26, 1863; pg. 16; Issue 24568; col A
-another ad. Stortz's Gallery, Bold-street, Liverpool, are offering for sale by tender the stock (7000 negatives, cameras, lenses) and the remainder of the lease. Since the recent fire the premises have been throughly repaired and decorated (!). The contact person listed is J. T. Ellerbeck of 18 Bold-street - are you familiar with this person? Must have been some sort of business partner.
Same ad ran May 28.
That's all, although there is the mention in 1941 of a marriage of a daughter of 'the late Ida Stortz Brown'... could this be a relative?