Not sure about the link above re 188 Sqn. Wickapedia and the RAF web site, (both I know, not the most authoritative of sites); however, in this case they are backed up by Air of Authority; all saying that 188 was not reactivated in pre war expansion or during WW2, having been disbanded in 1918.
The only 188 Sqn I can think of was the fictional Lancaster unit in the 1952 film Appointment in London.