The North Lanarkshire Heritage Centre in Motherwell is also worth contacting.
I obtained information from there on lair purchases in the old Welwynd Churchyard in Airdrie.
The archivist was very helpful.
It was pre lockdown/covid  
www.culturenl.co.uk  NL Heritage Centre: 01698 274590
 Archives: 01698 274597
 Local Studies: 01698 274595