Yes.
At least two London boroughs - Hammersmith & Fulham and Richmond-upon-Thames - already had a lot of them in the 1970s and 80s too. In fact, as I recall in both those boroughs pink lamps, rather than the high pressure yellow sodium lamps, were the norm on side streets for many years - certainly all through the 1980s, 90s and early 2000s.
In West Sussex the 80s norm seemed to be pink lamps on main roads and larger urban roads (with yellow sodium in some places, notably the A27) and white mercury lights on the side streets. New mercury lights were still going up in the mid-80s. West Sussex didn't go in for yellow sodium as much as other counties, ironically they actually increased their yellow sodium count later in the 80s.
By contrast Hampshire was very much yellow sodium-land, both on main roads and on side streets.
The pink lamps around in 1979 survived until around 2014 in some places. Like neighbouring Hampshire, Surrey and Dorset (another former pink lamp hotspot, particularly Poole) West Sussex had a wholesale replacement of lights in the 2010-15 period.