Please note the wyeast yeasts are sent out without any cooling products, we been selling liquid yeasts for years and have very little trouble Just try to avoid ordering on a Friday as they could be sat in the Parcel Force depot over the weekend.
When using any liquid yeasts good idea to have a dried yeast as a backup
The date on the wyeast is MFG which is the manufacturing date not the BBE date 6 months from this date is best