Yeah, I do indeed! Available in caramel and chocolate versions, made by Bird's Eye, as you say. In a 'blobby' tub if I remember rightly. Very smooth, but of course crunchy if not properly thawed!
The mousses (I think) were in plain-sided tubs, the domed bases of which you could pop in and out, hopefully not near somebody's ear. Not sure if these tubs still exist - will look in Tesco next time for old time's sake.
Remember 'Star Turn'? Probably about 1977-78, in choc and mint versions?