This is what they tend to do. This batch won't be ready for like a year. They usually have a batch from the year before that they will be using or maybe even 2 years before.
The stuff doesn't go off so long as it's kept away from moisture. High salt and oil content. If some water gets in it will ruin the full batch.
Plenty of recipes on YouTube. I might get my cousin to get her mum to write down her recipe's for me next time I visit them in Canada.
I stayed with her mum in India about 16 years ago. I ate her full year's supply of chilli achar in like 3 weeks. It will be hard to get a hold of the exact chillies here. They were long and red. I'd say 5 inches in length or more and they weren't thin either like 3 times as thick as the green chillies you get here.
If you are ever in Glasgow. I'd give this place a call before you visit and they should be able to make you achar and it be ready for when you get here.
http://www.ranjitskitchen.com/menu
They also do catering orders for samosas for parties.
I'd also sit in and try their thali or some parathas with pickle and yogurt.
It's extremely cheap too for the quality.