Think his shop was in Peel - in 1861 Leech's guide under Chemists & Duggists : Allpress Edwd. Robt., Douglas st PEEL
and in 1863 also in Peel Allpress Edwd.Robt., Market qt.; h. Atholl street
(not sure if qt is a correct transcription - could be Market St or sqr, either way it is also close to Douglas St.