I have hairdressers in my family too.
Some resources on this topic are:
German Hairdressers in the UK, by Jenny TOWEY, pub. Anglo-German Family History Society, 2004. (Even though this is specifically about the Germans, it gives you some of the social history on the early closing movement, which all hairdressers were affected by.)
BOOTH, Charles. Life and Labour of the People in London., Series 2 (Industry), Vol.4, p.271.
ANDREWS, William. At the sign of the barber's pole : studies in hirsute history. Cottingham : J.R. Tutin, 1904. It's short, and entertaining!
Journals/newspapers available at the British Library Newspaper Library, Colindale, London:
The Hairdressers’ Weekly Journal , 6 May 1882 - 30 Dec.1948. In hard copy, 4 volumes per year. Contains obituaries and other news items.
The Hairdresser (London). Numbers no.1-8. Dates Jan. - Aug. 1892, then discontinued.
The Hairdresser (The official organ of the International Union of Journeymen Hairdressers of London). Numbers no.1-5. Dates 15 Jan. - 15 May 1912.
The Hairdressers' Chronicle and Trade Journal. subtitle: The Hairdressers' Chronicle & Beauty Specialists' Trade Journal. Numbers no.1-2175. 1 Nov.1866 - 24 May 1929.
The Boro' of West Ham, East Ham, and Stratford Express., 21 Nov. 1908 issue has an article on hairdressers.
I have also seen references to a magazine called Hairdressing, which began in 1908, but don't know where to find it.
In German:
MAEHNERT, Carsten Geschichte des Celler Friseur-Handwerks -- Bader, Barbiere, Perückenmacher und Friseure im Wandel der Zeit (History of the Celle barber trade – barbers surgeons, barbers, wig makers and hairdressers in changing times)
Series: Schriftenreihe Bomann-Museum und Stadtarchiv Celle. Celle, Germany: Schweiger & Pick, 1986. ISBN 3-925902-04-X. In German. 143 pages.
I will update as I find more.