My garden is clay based. It has had soil improvement and is acidic. How do I prepare and select the sit for my meconopsis Lingholm?
These articles will help you.
https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/how-to-improve-clay-soil.htm
https://www.gardeningknowhow.com/special/organic/how-to-easily-improve-your-clay-soil.htm
https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/how-to-tell-if-your-soil-is-clay.htm
What's eating my Meconopsis?
Slugs and Snails are the most likely culprits.
These articles will help you.
https://www.gardeningknowhow.com/plant-problems/pests/insects/kill-garden-slugs.htm
https://www.gardeningknowhow.com/plant-problems/pests/insects/organic-snail-control.htm
Kept the seeds in the fridge for a few weeks, sowed on surface of seed compost, covered thinly with vermiculite, placed in cool south facing conservatory. Been 2 months not germinating. Been keeping moist, but not overwatering
Patience is a virtue here; Meconopsis germination may take several months. You might try removing the vermiculite. They need light to germinate. Here is more:
https://www.missouribotanicalgarden.org/PlantFinder/PlantFinderDetails.aspx?taxonid=266564
https://www.rhs.org.uk/plants/174993/meconopsis-(fertile-blue-group)-lingholm/details