It sounds like your supplier is using some trade names instead of characteristics. Some of these can be found in the add-ons as optional suppliers.
Ashbourne Mild is a Briess product. That goes at about 5.5 lovibond and follows the specs of UK Pale Malts. Just copy and change the color. Light toasted bread flavor.
English Dark Crystal is likely Simpson's (since they go light, medium, dark and extra dark) and it's about 75 lovibond. Somewhat raisny; the jam for the Mild's toast!
Bairds Carastan has two flavors, 15 and 35 lovibond. Both are very similar to Briess Victory malt in spec. Toast and toffee.
Best of luck. Any respectable supplier will gladly give you the specs for malt, hops and yeast. If they don't, you have alternatives.