Can the standard L322 front seats, which obviously have manual electric controls, be upgraded to memory by simply adding the higher spec seat valance button switch cluster that has the 3 memory position buttons I wonder?

Put another way, do the seats (Driver's seat is the one that matters really) already have the extra position sensing gubbins in place, that just need the appropriate switch unit to enable (plus some IIDTool magic too presumably)

The reason being yours truly and SWMBO are now busily engaged in a seat adjustment duel  "Gloria" 2002 L322 Voguish V8 LPG - carcass
"Jessica" 1996 Disco 1 300 TDi Auto
"Harriet" 1994 Disco 1 300 TDi Manual - Gone
"Daisy" 1992 Disco 1 200 TDi Manual - Gone