Thanks man, unfortunately I had no patience and ended up ordering
Cara ruby 50 - (castle malting) EBC 43-57
Cara blond 20 -(castle malting)EBC 18-22
Crystal 100 -( Viking malt) EBC 100
Thinking wrongly that I would land somewhere quite near the recipe by just bumping up the 20 and 50 whilst minimizing the 100.
That link was perfect and I've learned a lesson now.
So according to SRM=EBC x 0.508
That leaves me sitting here with something in the region of
It's strange as they don't seem to stock anything that lands right on 40,60 or 80. Seems to be all or nothing. It might be possible to hit 50,75,100 instead. But I really wanna try this exact recipe
I guess I'll just have to brew it up and see how it goes as I search the illusive crystal, 40,60 and 80. When alls said and done, I'm still gonna have good beer
Thanks for all the help, much appreciated.