I didn't think IoWSG made them in anything but the Azurene finish, Rosie, although checking the book - I see that in 1983 only, a few coloured ones were tried - but I don't know in what, if any, patterns or colour mixes.
Your IoWSG ones have that little turn to the head, which gives them character - the St. John's one's don't have that - they're more just lumps of glass in a set shape.
However, never say never!
As you know, there's a new range of maximals/minimals out - officially all azurene - but I have a little penguin, in just surface decorated in plain blue. (Labelled - it was my free gift for renewing my subscription)