Rivet Joint
LPV explained here:
https://www.thebalance.com/localizer...pproach-282711
Great advance over ILS, no expensive equipment to buy/maintain and does not need the recurring expense of having to flight check it every six months.
The only expenditure required is a obstacle survey, which is checked annually (already needed to sustain other instrument approach procedures and the EASA Aerodrome Certification) and paying someone to design the procedure and get it approved by CAA. Last time I was quoted for one was less than £50K.