Tips on saving VHS can be found at the Nga Taonga site here
Their main archive facilities are in Wellington (Wellington central and Avalon, Lower Hutt) but there are facilities in Christchurch and Auckland.
Email information@ngataonga.org.nz
Also the National Preservation Office at the Alexander Turnbull Library can provide preservation and conservation advice on how to care for VHS, film and photos treasures so future generations can continue to enjoy them.
More information can be found on the National Library website or by emailing preservation@dia.govt.nz
A number of private companies transfer VHS to a digital format.
Suggestions from listeners on where to get VHS tapes digitised
Bring it On studios
Dub Shop
Dub shop Wellington