So now I've cast off and have to do "the mirror image" for the other side of the vee neck.
The Pattern (verbatim):
1st row - P3, C4F, P6 knit to last 2, K2tog
2nd row - P2tog, purl to last 13, K6, P4, K3
3rd row - P3, K4, P6, sl 1, K1, peso, knit to last 2, K2tog
4th row - P2tog, purl to last 13, K6 P4, K3.
BUT I'm slightly confused exactly which decreases to knock off to make it the same (but mirror) as before, advice appreciated.