I don't think it is actually Isle of Wight Studio Glass, not unless it's something from the maker's shelves, or an experimental/trial thing, but it could be related - via a glassmaker who trained there for example, that's if it dates back to the early '70s. If later, which it could well be, I think the technique for applying the foils had become much more widespread.
Gold foil isn't a problem, but Silver is - it was Michael Harris and William Walker who had worked together on getting that right for the Azurene range.